Most effective acne treatments work by altering skin cell turnover, reducing oil production, or killing bacteria. These actions inevitably affect healthy skin to some degree, which is why side effects are common — especially in the first weeks of treatment.
Topical Treatment Side Effects
Retinoids (Adapalene, Tretinoin)
- Dryness and peeling: Almost universal in the first 4–6 weeks. Use a ceramide-based moisturiser and start with every-other-night application.
- Initial breakout (purging): Retinoids accelerate cell turnover, which can temporarily worsen acne before it improves. This usually resolves by week 6–8.
- Sun sensitivity: Always wear SPF 30+. Apply retinoids in the evening only.
Benzoyl Peroxide
- Dryness and irritation: Start at 2.5% to minimise this. Reduce application frequency if needed.
- Contact allergy: Rare but possible. Stop use if you develop hives or significant swelling.
- Bleaching: Stains clothes, towels, and bedding. This is a practical nuisance rather than a medical concern.
Oral Antibiotic Side Effects
Lymecycline and Doxycycline
- Nausea and stomach upset: Take with food and a full glass of water. Doxycycline is more likely to cause GI symptoms.
- Photosensitivity: Tetracyclines significantly increase sunburn risk. Daily SPF is essential.
- Thrush: Antibiotics can disrupt normal flora, leading to oral or vaginal thrush. Probiotics may help, though evidence is mixed.
Isotretinoin (Roaccutane) Side Effects
Isotretinoin is the most powerful acne treatment available and carries the most significant side-effect profile:
- Severe dryness: Lips, skin, eyes, and nasal passages. Lip balm and eye drops become daily essentials.
- Musculoskeletal pain: Joint and muscle aches are common, particularly during exercise.
- Mood changes: While large studies have not confirmed a causal link with depression, patients are monitored regularly. Report any mood changes to your dermatologist promptly.
- Teratogenicity: Isotretinoin causes severe birth defects. Women must use effective contraception and undergo regular pregnancy tests.
When to Seek Help
Most side effects are manageable and temporary. However, contact your prescriber if you experience severe headaches, vision changes, persistent low mood, or signs of allergic reaction. Never stop a prescribed treatment without medical guidance.