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What Antibiotics Are Used to Treat Skin Infections? A Complete Skin Infection Antibiotic Guide
Skin infection antibiotic guide: compare options for cellulitis, impetigo & MRSA, know the risks, and learn when to see a doctor. Pharmacist-reviewed.
By the A2Z RX editorial team · Published October 13, 2026
Quick Q&A: Skin Infection Antibiotics at a Glance
Which antibiotics are used to treat skin infections?
It depends on the infection and the likely bacteria. Impetigo is often treated with topical mupirocin, cellulitis usually with oral cephalexin, dicloxacillin, or clindamycin, and suspected MRSA with doxycycline or trimethoprim-sulfamethoxazole. A prescribed skin infection antibiotic such as amoxicillin-clavulanate may be chosen for bites and mixed infections.
Does every skin infection need antibiotics?
No. Small abscesses are usually drained, and fungal or viral rashes need different medicines.
How long is a typical course?
Often 5 to 7 days for uncomplicated cellulitis that is improving. Your prescriber sets the exact length.
When is it an emergency?
Fast-spreading redness, fever, severe pain out of proportion to the look of the skin, numbness, or dark blisters need same-day care.
Skin is your largest barrier against bacteria, and a small break from a scratch, insect bite, shaving nick, or surgical wound can let germs in. Most infections respond well to timely treatment, yet the wrong drug, the wrong duration, or no medical assessment can let a minor problem become a hospital stay. This guide explains how clinicians choose antibiotics, what each option does well, where it falls short, and how to use it safely. It was prepared by the pharmacy content team at A2Z RX LLC, a licensed U.S. online pharmacy, and is educational rather than a substitute for an examination.
Common Types of Skin Infections and What Causes Them
Bacterial skin and soft tissue infections are mostly caused by Staphylococcus aureus (including methicillin-resistant strains, MRSA) and group A Streptococcus. Recognizing the pattern helps explain why treatments differ.
Infection | What it looks like | Usual bacteria |
|---|---|---|
Impetigo | Honey-colored crusts, often on the face; common in children | Staph aureus, Strep |
Folliculitis | Small pimple-like bumps around hair follicles | Staph aureus (sometimes Pseudomonas from hot tubs) |
Abscess/boil | Painful, pus-filled lump | Staph aureus, often MRSA |
Cellulitis | Warm, red, swollen, tender, spreading skin | Strep, Staph aureus |
Erysipelas | Sharply raised, bright red patch, often on the face or legs | Group A Strep |
Bite wound infection | Redness, swelling or discharge after a dog, cat or human bite | Mixed aerobic and anaerobic bacteria |
How a Skin Infection Antibiotic Is Chosen
Prescribers weigh several factors before writing a prescription. Understanding them also shows why sharing leftover pills is unsafe.
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