Here’s concise advice about using Pernex AC 2.5% gel (benzoyl peroxide) for your back acne and pigmentation.

⚕️ What this likely is

• You have back acne (posterior trunk acne) with post‑inflammatory hyperpigmentation; benzoyl peroxide (BPO) is effective for inflammatory lesions but less effective alone for existing pigmentation.

💊 How to use Pernex AC 2.5% Gel

• Apply a thin layer to clean, dry affected areas once daily at night for 1 week, then increase to twice daily if your skin tolerates it.
• Avoid broken skin, eyes, mouth; BPO can bleach clothes/linen. This product is topical and available without a prescription.

🏥 Self-care and helpful adjuncts

• Use a gentle cleanser, avoid harsh scrubs, wear breathable clothing, and use sunscreen (SPF 30+) on exposed skin to reduce pigmentation worsening.
• For pigmentation, combining or switching to agents like azelaic acid or topical retinoids (under doctor guidance) is often more effective than BPO alone.

⚠️ Side effects / warning signs

• Common: dryness, redness, peeling.
• Stop and see a doctor if you get severe swelling, widespread blistering, or difficulty breathing (possible allergic reaction).
• If you are pregnant or breastfeeding, check with a dermatologist before use.

🩺 When to see a doctor

• See a dermatologist if you have painful nodules/cysts, worsening acne despite 6–8 weeks of BPO, persistent pigmentation, or severe irritation.

If you want, I can explain how to layer treatments for pigmentation or suggest sunscreen and gentle cleansers.

🩺 FOLLOW_UP

• Are you pregnant or breastfeeding, or do you have any known allergy or past severe reaction to topical acne products?