{"hq_id":"hq-p-bdy-000157","name":"Eyelash Extension Adhesives (Cyanoacrylate, Formaldehyde Off-Gassing, Allergic Contact Dermatitis, Corneal Damage)","category":{"primary":"personal_care","secondary":"eyelash_extensions","tags":["eyelash extensions","cyanoacrylate","formaldehyde","allergic contact dermatitis","corneal damage","eye irritation","beauty treatment"]},"product_tier":"BDY","overall_risk_level":"moderate","description":"Professional eyelash extension adhesives are cyanoacrylate-based (ethyl or butyl cyanoacrylate) and release formaldehyde gas as they cure — a reaction that occurs in the confined space directly adjacent to the eye. Formaldehyde is a potent sensitizer: 2-5% of the general population and up to 20% of eczema patients are allergic. Once sensitized, clients experience progressively worse reactions with each application. FDA has received hundreds of adverse event reports related to eyelash adhesives including corneal abrasion, lid swelling, and permanent eyelash loss. A 2019 Contact Dermatitis journal study found that 34% of eyelash extension wearers developed allergic contact dermatitis within 6 months of starting extensions. The adhesive must cure within millimeters of the eye — there is no safe buffer distance, making this an inherently high-exposure application.","synthesis":{"derived_risk_level":"severe","synthesis_confidence":0.82,"synthesis_method":"compound_composition","context_used":"human_adult","context_source":"product_users","exposure_modifier":1,"vulnerability_escalated":false,"escalation_reason":null,"compounds_resolved":1,"compounds_total":1,"synthesis_date":"2026-03-27","synthesis_version":"1.0.0"},"hazard_summary":{"sensitive_populations":"individuals with eczema or contact allergy history (20% sensitization rate), contact lens wearers, lash technicians (daily exposure)","overall_risk":"moderate","primary_concerns":["Formaldehyde off-gassing during curing directly adjacent to eyes","34% of wearers develop allergic contact dermatitis within 6 months","Progressive sensitization — reactions worsen with each application","Corneal abrasion and permanent eyelash loss reported to FDA"],"exposure_routes":"Inhalation (formaldehyde fumes at application distance). Dermal (cyanoacrylate and released formaldehyde on periorbital skin). Ocular (fume irritation through closed eyelids)."},"exposure":{"routes":["inhalation","dermal"],"contact_types":["inhalation_acute","dermal_direct","ocular_adjacent"],"users":["adult","worker"],"duration":"acute_repeated","frequency":"biweekly_to_monthly","scenarios":["Client: formaldehyde inhalation and periorbital skin contact during 1-2 hour application","Lash technician: daily occupational exposure to cyanoacrylate fumes in poorly ventilated rooms","Allergic client: progressive contact dermatitis worsening with each fill appointment","Corneal exposure: adhesive contact or fume irritation during application when eyes are closed but not sealed"],"notes":"Cyanoacrylate polymerization releases formaldehyde (0.5-2.5 ppm measured at application distance). Formaldehyde OSHA PEL: 0.75 ppm TWA. Sensitization: 2-5% general population; up to 20% of eczema patients. Cross-reactivity: clients sensitized to formaldehyde may react to formaldehyde-releasing preservatives in other cosmetics. FDA MedWatch: hundreds of adverse event reports for eyelash adhesives including corneal abrasion, allergic reactions, permanent hair loss. Contact Dermatitis journal (2019): 34% incidence of ACD in eyelash extension wearers within 6 months."},"consumer_guidance":{"usage_warning":"Patch test before first application and after any break longer than 4 weeks. If you experience itching, swelling, or redness after application, you may be developing sensitization — further applications will worsen the reaction. Ensure your technician works in a ventilated room with a fume extractor. Remove extensions if you develop any eye irritation. Report adverse events to FDA MedWatch.","safer_alternatives":["Magnetic false eyelashes (no adhesive contact)","Strip lashes with latex-free temporary adhesive","Lash lifts/perms (semi-permanent curl without adhesive extensions)","Formaldehyde-free adhesive formulations (lower bond strength, shorter wear)"]},"regulatory":{"applicable_regulations":[{"jurisdiction":"USA","regulation":"FDA Cosmetics Regulation — Eyelash Adhesives Subject to FDCA","citation":"21 USC 361 (adulterated cosmetics); 21 USC 362 (misbranded cosmetics); FDA Modernization of Cosmetics Regulation Act (MoCRA) 2022","requirements":"Eyelash adhesives regulated as cosmetics under FDCA. MoCRA (2022) requires adverse event reporting, facility registration, and ingredient listing for cosmetics. FDA can take action against adhesives causing injury. No pre-market approval required for cosmetics. Formaldehyde must be listed on ingredient label if intentionally added (but off-gassing from cyanoacrylate not required to be declared).","compliance_status":null,"effective_date":"2022-12-29","enforcing_agency":"FDA Center for Food Safety and Applied Cosmetics","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":false,"disposal_guidance":"Dispose of adhesive tubes as household waste. Do not attempt to remove extensions with solvents — use professional oil-based remover.","hazardous_waste":false,"expected_lifespan":"Extensions last 2-4 weeks between fill appointments"},"formulation":{"form":"varies","key_ingredients":[],"certifications":[]},"materials":{"common":[],"concerning":[],"preferred":[]},"compound_composition":[{"hq_id":"hq-c-org-000011","compound_name":null,"role":"off_gas_product","typical_concentration":"formaldehyde released during cyanoacrylate curing; IARC Group 1; sensitizer at ppb levels near eye"}],"identifiers":{"common_names":["eyelash extension adhesives (cyanoacrylate, formaldehyde off-gassing, allergic contact dermatitis, corneal damage)"],"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":"2026-05-02T18:16:08.405Z"}}