Infected Pimple (Pustule) on Arm: Safe Treatment and What to Avoid

Do not squeeze or pop a pus-filled pimple. This forces bacteria deeper, spreads infection, increases scarring risk, and can lead to cellulitis or abscess formation.

Safe Home Care

• Cleanse Gently: Wash with mild soap and warm water 2×/day; pat dry.
• Warm Compresses: Apply clean, warm (not hot) washcloth for 10–15 minutes, 3–4×/day. Promotes drainage naturally.
• Topical Antimicrobial: OTC benzoyl peroxide 2.5–5% or clindamycin (if prescribed) after cleansing.
• Cover Loosely: Sterile non-stick bandage if draining or in friction area.
• Hands Off: Avoid touching; wash hands before/after care.

When to Seek Medical Care

• No improvement in 2–3 days.
• Spreading redness, warmth, streaking (lymphangitis).
• Fever >100.4°F (38°C).
• Increasing pain or swelling.
• Immunocompromised (diabetes, HIV, immunosuppressants).
• Large, deep, or recurrent lesions.

Medical Treatments

• Incision & drainage (I&D) for fluctuant abscesses.
• Oral antibiotics (cephalexin, doxycycline, TMP-SMX) for cellulitis or systemic signs.
• Culture if MRSA suspected or treatment fails.

Prevention

• Daily gentle cleansing; shower after sweating.
• Loose, breathable clothing.
• Clean razors; don't share towels/razors.
• Manage underlying folliculitis triggers (occlusion, friction, Staphylococcus carriage).

Most pustules resolve with conservative care. Squeezing converts a local issue into a spreading infection.