{"hq_id":"hq-p-bdy-000162","name":"Chemical Peel Treatments (Glycolic Acid, Salicylic Acid, TCA, pH-Dependent Burns, At-Home vs Professional)","category":{"primary":"personal_care","secondary":"skincare_treatment","tags":["chemical peel","glycolic acid","salicylic acid","TCA","trichloroacetic acid","AHA","BHA","pH","burn","skin resurfacing"]},"product_tier":"BDY","overall_risk_level":"moderate","description":"Chemical peels use concentrated acids — glycolic acid (AHA, 20-70%), salicylic acid (BHA, 15-30%), and trichloroacetic acid (TCA, 10-35%) — to induce controlled chemical injury to skin layers, stimulating regeneration and treating acne, hyperpigmentation, and photoaging. The critical safety variable is pH, not acid concentration alone: a 30% glycolic acid solution at pH 1.5 causes significantly deeper injury than the same concentration at pH 3.5. At-home peel products (typically 10-30% glycolic or 2% salicylic) have become widely available without dermatologist oversight, leading to chemical burns, post-inflammatory hyperpigmentation (PIH), and scarring, particularly in individuals with darker skin tones (Fitzpatrick IV-VI) where PIH risk is highest. Professional TCA peels at concentrations above 25% can reach the reticular dermis and cause permanent scarring if applied incorrectly.","synthesis":{"derived_risk_level":"insufficient_data","synthesis_confidence":0,"synthesis_method":"none","context_source":null,"compounds_resolved":0,"compounds_total":0,"synthesis_date":"2026-03-27","synthesis_version":"1.0.0"},"hazard_summary":{"sensitive_populations":"individuals with Fitzpatrick IV-VI skin (PIH risk), sensitive/rosacea-prone skin, at-home users without dermatologist guidance","overall_risk":"moderate","primary_concerns":["pH-dependent burn injury — same acid concentration causes different depths depending on pH","At-home products lack pH disclosure, skin typing, or neutralization guidance","Post-inflammatory hyperpigmentation risk highest in darker skin tones","TCA >25% can cause permanent scarring if applied incorrectly or left too long"],"exposure_routes":"Dermal (sole route — direct acid application to facial or body skin)."},"exposure":{"routes":["dermal"],"contact_types":["dermal_direct"],"users":["adult"],"duration":"acute","frequency":"monthly_to_quarterly","scenarios":["At-home peel: consumer applies 30% glycolic acid without understanding pH buffering — chemical burn","Professional peel: 25-35% TCA reaches deep dermis; healing requires 7-14 days of wound care","Skin of color: higher PIH risk from aggressive peels — can cause months of persistent dark spots","Sensitive skin: contact dermatitis or barrier disruption from salicylic acid overuse"],"notes":"Chemical peel classification: superficial (epidermis: glycolic 20-50%, salicylic 15-30%), medium (papillary dermis: TCA 25-35%, Jessner's solution), deep (reticular dermis: phenol 88%, TCA >35%). pH is critical: free acid concentration = f(acid%, pH, pKa). Glycolic acid pKa 3.83 — buffered pH 3.5+ dramatically reduces free acid vs unbuffered pH ~1.5. At-home risks: no pH disclosure on most consumer products, no skin typing guidance, no neutralization instructions. PIH risk: Fitzpatrick IV-VI (melanin-rich skin) — aggressive peels trigger melanocyte hyperactivation. FDA: chemical peels classified as cosmetics at low concentration, drugs/devices at professional concentration."},"consumer_guidance":{"usage_warning":"Start with the lowest concentration (10% glycolic or 2% salicylic) and test on a small area. Never leave peels on longer than directed. Neutralize with water immediately if burning is intense. Avoid chemical peels if you have active sunburn, eczema, or broken skin. Darker skin tones should start with superficial peels only and consult a dermatologist. Use SPF 30+ daily for 2+ weeks after any peel.","safer_alternatives":["Enzyme peels (papain, bromelain — gentler than acid peels)","PHAs (polyhydroxy acids — lactobionic acid, gluconolactone; larger molecules, less irritation)","Microdermabrasion (mechanical exfoliation, no chemical injury)","Dermatologist-supervised peels with pre-treatment skin typing and custom formulation"]},"regulatory":{"applicable_regulations":[{"jurisdiction":"USA","regulation":"FDA Classification of Chemical Peels — Cosmetic vs Drug vs Device","citation":"21 USC 321(i) (cosmetic definition); 21 USC 321(g)(1) (drug definition); FDA Guidance on AHA Cosmetics","requirements":"Chemical peels at consumer concentrations (≤10% AHA, ≤2% BHA) regulated as cosmetics. Professional-strength peels making drug claims (treat acne, reduce wrinkles) require drug registration. TCA and phenol peels at medical concentrations are regulated as medical procedures, not products. FDA AHA guidance: recommend consumer AHA products not exceed 10% concentration at pH ≥3.5.","compliance_status":null,"effective_date":null,"enforcing_agency":"FDA CFSAN / CDER","penalties":null,"source_ref":null}],"certifications":[],"labeling":{"required_disclosures":[],"prop65_warning":{"required":null,"chemicals":[],"endpoint":null,"notes":null},"ghs_labeling":{"required":null,"signal_word":null,"pictograms":[],"hazard_statements":[],"notes":null},"hidden_ingredients":{"trade_secret_protected":null,"categories_hidden":[],"estimated_count":null,"known_concerns":null,"notes":null},"notes":null},"recalls":[],"regulatory_gap":null,"notes":null},"lifecycle":{"recyclable":true,"disposal_guidance":"Dispose of expired acid products in household trash. Neutralize any spills with baking soda and water.","hazardous_waste":false,"expected_lifespan":"Peel effect: 2-6 weeks; product shelf life 6-12 months once opened"},"formulation":{"form":"varies","key_ingredients":[],"certifications":[]},"materials":{"common":[],"concerning":[],"preferred":[]},"compound_composition":[],"identifiers":{"common_names":["chemical peel treatments (glycolic acid, salicylic acid, tca, ph-dependent burns, at-home vs professional)"],"aliases":[],"manufacturer":null,"brands":[]},"brand_examples":[],"sources":[{"type":"expert_curation","name":"ALETHEIA Safety Database","date":"2026-03-26"}],"meta":{"schema_version":"4.0.0","last_updated":"2026-03-26","timestamp":"2026-05-02T18:19:22.829Z"}}