Blackheads: Causes, Prevention & Evidence-Based Treatment

Blackheads (open comedones) are oxidized sebum/keratin plugs in dilated follicles—not dirt.

Pathogenesis

• Hyperkeratinization + ↑ sebum → microcomedone → open comedo.
• Melanin + lipid oxidation → black color.

Contributing Factors

• Genetics (pore size, sebum rate).
• Androgens (puberty, PCOS, hormonal IUD).
• Comedogenic products (coconut oil, cocoa butter, isopropyl myristate).
• Occlusion (masks, helmets, heavy makeup).
• Diet: High glycemic load, dairy (weak association).

Treatment Ladder

Tier	Agents	Mechanism
1. OTC Topical	Salicylic acid (BHA) 0.5–2%, Benzoyl peroxide 2.5–5%, Adapalene 0.1% (Differin OTC)	Keratolytic, anti-inflammatory, normalize keratinization
2. Prescription Topical	Tretinoin, Tazarotene, Trifarotene, Clindamycin/BP combo	Stronger retinoid, antimicrobial
3. Procedures	Extractions (by pro), Chemical peels (SA, GA), Microdermabrasion, Laser (1550 nm)	Physical removal, resurfacing
4. Systemic	Isotretinoin (severe, scarring), Hormonal (OCP, spironolactone for women)	↓ Sebum, remission

Prevention Routine

• Cleanse 2×/day (gentle, pH-balanced).
• Non-comedogenic moisturizer + sunscreen.
• Retinoid nightly (long-term comedolysis).
• Weekly BHA leave-on or clay mask.

Don't

• Squeeze (→ PIH, scarring, rupture → inflammation).
• Over-scrub (barrier damage → more oil).
• Use pore strips (temporary, irritates).