Avskinov
LTN HELL NIGGERS
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ONLY TALKING ABOUT TOPICAL DRUGS HERE ORALS ON NEXT PART
1.THIS IS MY THREAD FOR 500 POSTS CELEBRATION
2.I USED CLAUDE FOR FORMATTING
1. MINOXIDIL
2.TRETINOIN
LETS TALK ABOUT PATHWAYS IT GOES
PATHWAY HACKS PLUS MINIMIZING SIDE EFFECTS
PATHWAY HACKS
1.
Chemical exfoliation on off-nights
AHAs (glycolic, lactic) and BHAs (salicylic) accelerate surface shedding independently of tret's deeper turnover mechanism. Together they work on two layers tret from below, acids from above. Never same night.
Reduce TEWL between applications
Tret-accelerated turnover temporarily impairs the barrier, increasing transepidermal water loss. Niacinamide repairs the lipid envelope between tret applications, letting the next application work on healthy skin
Hyaluronic acid before moisturiser
Tret-thinned stratum corneum dehydrates faster. Keeping skin optimally hydrated (HA serum under moisturiser) lets keratinocytes function efficiently and shed correctly, preventing the dry clumping that causes flaking instead of clean turnover.
Block UV-triggered melanin upregulation
UV radiation is the strongest known stimulator of tyrosinase. Every minute of unprotected sun exposure undoes tret's tyrosinase suppression. SPF doesn't just prevent new damage it is an active part of the depigmentation
Niacinamide
Reduce blotchy vasodilation
Early tret use causes irregular vasodilation (redness, blotchiness) before organised capillary remodelling occurs. Niacinamide reduces capillary permeability and calms surface redness, bridging the gap until tret's long-term vascular remodelling kicks in at 12+ months
Protect new capillary walls
New collagen formed in capillary walls is fragile without vitamin C. It prevents oxidative damage to new vascular structures tret is building, and reduces visible redness by strengthening capillary walls and reducing their permeability.
HOW TO APPLY ALL OF THESE WITH TRET
IK ALL YOU KNOW TO APPLY THESE SO WE WILL STICK TO SOME RULES WHILE APPLYING WITH TRET
1.Never use AHA or BHA the same night as tret they compete for the same skin layer and together cause serious irritation without extra benefit.
2.Never use vitamin C at night with tret vitamin C is acidic and destabilises the pH tret needs. Keep C strictly morning only.
3.AHAs once a week max to start, BHA twice a week max. As tret ramps up over months and turnover accelerates, you'll naturally need less exfoliation
.ALWAYS USE SUNSCREEN
4.The Vaseline barrier around lips and nose since LIPS AND NOSE SKIN ARE MORE THINNER THAN CHEEKS IF NOT APPLYING THIS IT WILL CAUSE IRRITATION
SAME SHII APPLIES FOR TAZAROTENE BUT BE MORE CAUTIOUS
3.BIMATOPROST
MAIN MECHANISM FOR HAIR
SIDE EFFECTS
Periorbital fat atrophy the most important one. Long-term prostaglandin use around the eye can cause a subtle hollowing or deepening of the orbital area due to localised fat loss. This is reversible on discontinuation but takes months. Minimise by applying only to the lash line skin, not spreading around the orbital
HOW TO MAXIMIZE IT
COMBINE IT WITH MINOXIDIL USE IT AFTER 30 MIN OF APPLYING MINOX APPLY THE SAME OLD WAY HOW YOU USE TO APPLY RECOMMENDED TO USE GEL OR FOAM FOR EYELASHES I USE GEL MINOX IT SPREAD LESS
TIP TO REDUCE PERIORBITAL FAT ATROPHY OR DARKENING
1.Niacinamide eye cream in the morning around the orbital bone directly counters the hyperpigmentation mechanism it inhibits melanosome transfer to keratinocytes independently of melanin production, the same way it works on PIH elsewhere on the face. This is the most practical daily counter to the darkening effect without stopping bimatoprost.
2.If darkening develops despite this, azelaic acid 10% applied to the darkened skin in the morning is a gentle depigmenting agent safe for the eye area
3.APPLY IT CAREFULLY
4. HYDROQUINONE
ITS PATHWAY
SIDE EFFCTS
skin irritation redness, dryness, burning, itching, contact dermatitis, and rare, severe skin darkening (exogenous ochronosis).
Ochronosis : a rare condition where the skin develops a bluish-black or slate-gray discoloration due to the buildup of pigment in the tissues
HOW TO USE IT. HOW TO MINIMIZE ITS SIDE EFFECT. HOW TO STACK
Apply at night only it oxidises rapidly in UV and sunlight, becoming inactive and potentially irritating. Thin layer to affected areas only, not the entire face. Do not apply to healthy skin around the target area unnecessarily prolonged contact with normal skin causes unwanted lightening.1.THIS IS MY THREAD FOR 500 POSTS CELEBRATION
2.I USED CLAUDE FOR FORMATTING
1. MINOXIDIL
2.TRETINOIN
Tretinoin (all-trans retinoic acid / ATRA) is a vitamin A derivative that works at the DNA level it literally changes which genes your skin cells express. Tretinoin is a prescription-strength topical cream or gel. It’s used trusted Source mainly to treat acne, sun-damaged skin, and fine wrinkles..
LETS TALK ABOUT PATHWAYS IT GOES
RAR / RXR nuclear receptor activation
Tretinoin penetrates the stratum corneum(outermost layer of epidermis) and binds to Retinoic Acid Receptors (RARα, RARβ, RARγ) and Retinoid X Receptors (RXR) inside the nucleus. These are transcription factor proteins when tret binds them, the entire receptor complex physically attaches to DNA at specific sequences called Retinoic Acid Response Elements (RAREs). This is the master switch that triggers everything below.
RARγ is the dominant receptor in skin. This is why skin-specific retinoids (like tazarotene) are designed to preferentially bind RARγ, reducing systemic effects
Accelerated epidermal cell cycle via AP-1 suppression
Tret downregulates AP-1 transcription factor activity (specifically c-fos and c-jun proteins). AP-1 normally slows keratinocyte differentiation. By suppressing it, tret dramatically accelerates the skin cell lifecycle from 28 days to 14 days. Cells are made faster, travel to the surface faster, and shed faster. This is what clears acne (comedones are ejected), improves texture, and causes the purge (all latent comedones get pushed out at once).
This pathway is also why tret thins the stratum corneum short-term (increasing UV sensitivity and transepidermal water loss) before it thickens long-term.
Collagen I/III upregulation + MMP inhibition
Via RAR activation, tret directly upregulates gene expression of procollagen type I and type III in fibroblasts the structural proteins of the dermis. Simultaneously, it inhibits Matrix Metalloproteinases (MMP-1, MMP-3, MMP-9) the enzymes that break down existing collagen. The result: you are both building more collagen and destroying less of it. This is the mechanism behind long-term skin thickening, wrinkle reduction, and improved firmness.
This effect is cumulative and takes months. At 6–12 months, dermal collagen density measurably increases on biopsy. At 18 months, the dermis is meaningfully
thicker.
TGF-β pathway stimulation
Tret stimulates Transforming Growth Factor Beta (TGF-β) signalling, which activates fibroblasts to produce more extracellular matrix components including collagen, elastin, and fibronectin. This is a secondary collagen pathway that runs parallel to the direct RAR-mediated procollagen gene activation above.
Melanin redistribution + tyrosinase downregulation
Tret acts on melanocytes (pigment-producing cells) by reducing tyrosinase expression the rate limiting enzyme in melanin synthesis. It also accelerates keratinocyte turnover so melanin-loaded cells are shed faster, breaking up the clustered melanin deposits that cause hyperpigmentation. This is the dual mechanism behind post-inflammatory hyperpigmentation (PIH) clearance: less production AND faster shedding.
This is why tret evens skin tone
Comedolytic action + sebocyte differentiation regulation
Tret normalises follicular keratinisation the process where dead keratinocytes inside the pore clump together and form a plug (comedone). By accelerating turnover, those cells don't get a chance to clump. It also modulates sebocyte (sebum-producing cell) differentiation via RARγ, reducing sebum output over time. This is why tret is the most effective comedolytic agent and why acne doesn't return during active use.
VEGF modulation + new capillary formation
Long-term tret use stimulates formation of new, organised dermal capillaries via VEGF (Vascular Endothelial Growth Factor) modulation. This is why chronic tret users develop that "lit from within" glow improved vascularisation means better nutrient delivery and oxygen to skin cells, improving skin colour and radiance at a structural level
This takes 12+ months. It's also why tret causes visible redness early on temporary vasodilation before vascular remodelling occurs.
Tretinoin penetrates the stratum corneum(outermost layer of epidermis) and binds to Retinoic Acid Receptors (RARα, RARβ, RARγ) and Retinoid X Receptors (RXR) inside the nucleus. These are transcription factor proteins when tret binds them, the entire receptor complex physically attaches to DNA at specific sequences called Retinoic Acid Response Elements (RAREs). This is the master switch that triggers everything below.
RARγ is the dominant receptor in skin. This is why skin-specific retinoids (like tazarotene) are designed to preferentially bind RARγ, reducing systemic effects
Accelerated epidermal cell cycle via AP-1 suppression
Tret downregulates AP-1 transcription factor activity (specifically c-fos and c-jun proteins). AP-1 normally slows keratinocyte differentiation. By suppressing it, tret dramatically accelerates the skin cell lifecycle from 28 days to 14 days. Cells are made faster, travel to the surface faster, and shed faster. This is what clears acne (comedones are ejected), improves texture, and causes the purge (all latent comedones get pushed out at once).
This pathway is also why tret thins the stratum corneum short-term (increasing UV sensitivity and transepidermal water loss) before it thickens long-term.
Collagen I/III upregulation + MMP inhibition
Via RAR activation, tret directly upregulates gene expression of procollagen type I and type III in fibroblasts the structural proteins of the dermis. Simultaneously, it inhibits Matrix Metalloproteinases (MMP-1, MMP-3, MMP-9) the enzymes that break down existing collagen. The result: you are both building more collagen and destroying less of it. This is the mechanism behind long-term skin thickening, wrinkle reduction, and improved firmness.
This effect is cumulative and takes months. At 6–12 months, dermal collagen density measurably increases on biopsy. At 18 months, the dermis is meaningfully
thicker.
TGF-β pathway stimulation
Tret stimulates Transforming Growth Factor Beta (TGF-β) signalling, which activates fibroblasts to produce more extracellular matrix components including collagen, elastin, and fibronectin. This is a secondary collagen pathway that runs parallel to the direct RAR-mediated procollagen gene activation above.
Melanin redistribution + tyrosinase downregulation
Tret acts on melanocytes (pigment-producing cells) by reducing tyrosinase expression the rate limiting enzyme in melanin synthesis. It also accelerates keratinocyte turnover so melanin-loaded cells are shed faster, breaking up the clustered melanin deposits that cause hyperpigmentation. This is the dual mechanism behind post-inflammatory hyperpigmentation (PIH) clearance: less production AND faster shedding.
This is why tret evens skin tone
Comedolytic action + sebocyte differentiation regulation
Tret normalises follicular keratinisation the process where dead keratinocytes inside the pore clump together and form a plug (comedone). By accelerating turnover, those cells don't get a chance to clump. It also modulates sebocyte (sebum-producing cell) differentiation via RARγ, reducing sebum output over time. This is why tret is the most effective comedolytic agent and why acne doesn't return during active use.
VEGF modulation + new capillary formation
Long-term tret use stimulates formation of new, organised dermal capillaries via VEGF (Vascular Endothelial Growth Factor) modulation. This is why chronic tret users develop that "lit from within" glow improved vascularisation means better nutrient delivery and oxygen to skin cells, improving skin colour and radiance at a structural level
This takes 12+ months. It's also why tret causes visible redness early on temporary vasodilation before vascular remodelling occurs.
PATHWAY HACKS PLUS MINIMIZING SIDE EFFECTS
PATHWAY HACKS
1.
Chemical exfoliation on off-nights
AHAs (glycolic, lactic) and BHAs (salicylic) accelerate surface shedding independently of tret's deeper turnover mechanism. Together they work on two layers tret from below, acids from above. Never same night.
Reduce TEWL between applications
Tret-accelerated turnover temporarily impairs the barrier, increasing transepidermal water loss. Niacinamide repairs the lipid envelope between tret applications, letting the next application work on healthy skin
Hyaluronic acid before moisturiser
Tret-thinned stratum corneum dehydrates faster. Keeping skin optimally hydrated (HA serum under moisturiser) lets keratinocytes function efficiently and shed correctly, preventing the dry clumping that causes flaking instead of clean turnover.
Block UV-triggered melanin upregulation
UV radiation is the strongest known stimulator of tyrosinase. Every minute of unprotected sun exposure undoes tret's tyrosinase suppression. SPF doesn't just prevent new damage it is an active part of the depigmentation
Niacinamide
Reduce blotchy vasodilation
Early tret use causes irregular vasodilation (redness, blotchiness) before organised capillary remodelling occurs. Niacinamide reduces capillary permeability and calms surface redness, bridging the gap until tret's long-term vascular remodelling kicks in at 12+ months
Protect new capillary walls
New collagen formed in capillary walls is fragile without vitamin C. It prevents oxidative damage to new vascular structures tret is building, and reduces visible redness by strengthening capillary walls and reducing their permeability.
HOW TO APPLY ALL OF THESE WITH TRET
IK ALL YOU KNOW TO APPLY THESE SO WE WILL STICK TO SOME RULES WHILE APPLYING WITH TRET
1.Never use AHA or BHA the same night as tret they compete for the same skin layer and together cause serious irritation without extra benefit.
2.Never use vitamin C at night with tret vitamin C is acidic and destabilises the pH tret needs. Keep C strictly morning only.
3.AHAs once a week max to start, BHA twice a week max. As tret ramps up over months and turnover accelerates, you'll naturally need less exfoliation
.ALWAYS USE SUNSCREEN
4.The Vaseline barrier around lips and nose since LIPS AND NOSE SKIN ARE MORE THINNER THAN CHEEKS IF NOT APPLYING THIS IT WILL CAUSE IRRITATION
SAME SHII APPLIES FOR TAZAROTENE BUT BE MORE CAUTIOUS
3.BIMATOPROST
Bimatoprost is a prostaglandin analogue originally a glaucoma drug (Lumigan eye drops) that dermatologists repurposed for cosmetic use after patients kept reporting unexpected hair and lash growth as a side effect.
MAIN MECHANISM FOR HAIR
It binds prostaglandin FP receptors on hair follicle cells, extending the anagen (active growth) phase of the hair cycle while simultaneously increasing the number of hairs in anagen at any given time. It also increases melanin in the hair shaft, making existing hairs appear darker and thicker. The FDA approved it as Latisse specifically for eyelash hypotrichosis.
SIDE EFFECTS
Periorbital fat atrophy the most important one. Long-term prostaglandin use around the eye can cause a subtle hollowing or deepening of the orbital area due to localised fat loss. This is reversible on discontinuation but takes months. Minimise by applying only to the lash line skin, not spreading around the orbital
HOW TO MAXIMIZE IT
COMBINE IT WITH MINOXIDIL USE IT AFTER 30 MIN OF APPLYING MINOX APPLY THE SAME OLD WAY HOW YOU USE TO APPLY RECOMMENDED TO USE GEL OR FOAM FOR EYELASHES I USE GEL MINOX IT SPREAD LESS
TIP TO REDUCE PERIORBITAL FAT ATROPHY OR DARKENING
1.Niacinamide eye cream in the morning around the orbital bone directly counters the hyperpigmentation mechanism it inhibits melanosome transfer to keratinocytes independently of melanin production, the same way it works on PIH elsewhere on the face. This is the most practical daily counter to the darkening effect without stopping bimatoprost.
2.If darkening develops despite this, azelaic acid 10% applied to the darkened skin in the morning is a gentle depigmenting agent safe for the eye area
3.APPLY IT CAREFULLY
4. HYDROQUINONE
HYDROQUINONE treats dark spots on the skin caused by hormones, aging, or sun exposure. It works by decreasing the amount of melanin, a pigment your body makes that gives your skin color. This reduces the appearance of dark spots. Sun prevention measures, including sunscreen, are often combined with this medication. It belongs to a group of medications called skin-lightening agents.
ITS PATHWAY
t's a phenolic compound that inhibits tyrosinase the rate-limiting enzyme in melanin synthesis but unlike other tyrosinase inhibitors it does this via multiple simultaneous mechanisms. It directly inhibits tyrosinase enzyme activity, suppresses tyrosinase gene transcription, degrades existing melanosomes, and is selectively cytotoxic to melanocytes at higher concentrations. It also inhibits DNA and RNA synthesis in melanocytes, slowing their proliferative activity. Nothing OTC comes close to this multi-point attack on the melanin pathway.
SIDE EFFCTS
skin irritation redness, dryness, burning, itching, contact dermatitis, and rare, severe skin darkening (exogenous ochronosis).
Ochronosis : a rare condition where the skin develops a bluish-black or slate-gray discoloration due to the buildup of pigment in the tissues
HOW TO USE IT. HOW TO MINIMIZE ITS SIDE EFFECT. HOW TO STACK
Cycle : 3 months on, 1–2 months off, then repeat if needed. Continuous use beyond 3 months without a break risks ochronosis a paradoxical blue-black darkening caused by melanin precursor accumulation in the dermis. This is rare but irreversible. The cycle rule exists for this reason specifically.
Always follow with SPF 50 in the morning UV immediately triggers the tyrosinase activity hydroquinone just suppressed, undoing the treatment daily.
STACK
4% hydroquinone at night is one of the most powerful combinations available outside the triple formula. Apply tret first using the sandwich method, let it absorb fully, then apply hydroquinone to the specific dark spots only as the last PM step before final moisturiser. The tret increases penetration of the HQ by thinning the stratum corneum and increases cell turnover to shed pigmented cells faster. The combination works meaningfully faster than either alone.
OTHER STUFF TO ADD
Vitamin C after cleanse independent tyrosinase inhibition. .Niacinamide — blocks melanosome transfer.
SRY FOR MY GOOFY AHH FORMATTING AND I USED CLAUDE FOR FORMATTING AND SOME WORDS GEMINI AND OTHER RESEARCH PAPER FOR THIS
