Why One Acne Treatment Doesn't Fit All
Acne is diagnosed as a single condition but presents as at least four mechanistically distinct subtypes. Using the wrong treatment not only fails — it can worsen the specific subtype you have. Correct diagnosis is the first intervention.
Type 1: Comedonal Acne
Characterised by non-inflamed blackheads (open comedones) and whiteheads (closed comedones). Caused by follicular hyperkeratinisation — abnormal buildup of keratinocytes inside the follicle, trapping sebum.
- Primary treatment: Retinoids (normalise follicular keratinisation); BHA (salicylic acid — dissolves sebum plugs)
- Avoid: Physical scrubs (can rupture comedones, converting them to inflammatory lesions)
- Timeline: 8–12 weeks minimum for significant clearance
Type 2: Inflammatory Acne
Papules, pustules, and nodules. Results when Cutibacterium acnes triggers an inflammatory cascade within a blocked follicle, activating toll-like receptors and releasing IL-1β, IL-8, and TNF-α.
- Primary treatment: Benzoyl peroxide (bactericidal, no resistance risk); adapalene; azelaic acid
- Adjunct: Niacinamide (anti-inflammatory); zinc (inhibits androgen conversion)
- Prescription options: Topical or oral antibiotics (with resistance caveats); tretinoin
Type 3: Hormonal Acne (Androgenic)
Deep, cystic lesions typically located on the jawline, chin, and lower cheeks. Driven by androgen-stimulated sebaceous gland activity. Peaks around menstruation (LH/FSH fluctuation), perimenopause, or androgen excess (PCOS).
- Topical: Retinoids; spironolactone (if Rx available as cream); DIM supplements (emerging evidence)
- Systemic (Rx): Oral spironolactone (anti-androgen); combined oral contraceptives; isotretinoin for severe cases
- Note: Topical-only protocols often provide limited improvement for true hormonal acne — systemic intervention is frequently required
Type 4: Fungal Acne (Malassezia Folliculitis)
Not true acne. A fungal infection of hair follicles by Malassezia yeast — presents as uniform, itchy, monomorphic papules and pustules, often on the forehead, chest, and upper back. Frequently misdiagnosed as bacterial acne and made worse by conventional acne treatments.
Key diagnostic sign: Fungal acne is unusually uniform — all lesions look the same size. It tends to itch. It does not respond to antibiotics (or worsens with them). It often flares after sweating or antibiotic courses.
- Treatment: Antifungal actives: ketoconazole (shampoo used as cleanser), selenium sulfide, zinc pyrithione
- Avoid: Fatty acids (feed Malassezia): oils, fatty acid-rich moisturisers
- Diet consideration: Reduce fermented foods and simple sugars temporarily
General Acne Treatment Hierarchy
| Severity | First Line | Second Line |
|---|---|---|
| Mild (comedonal) | BHA, retinol | Adapalene |
| Moderate (papulopustular) | BHA + benzoyl peroxide + niacinamide | Adapalene + benzoyl peroxide |
| Severe (nodular/cystic) | Dermatologist referral | Oral isotretinoin, oral antibiotics |
For the microbiome driver of acne, see Skin Microbiome. For hormonal mechanisms, see Psychodermatology.