MRSA skin infection
Most MRSA infections stay in the skin and soft tissue. Learn the common types, how they look, why they happen, and how they are treated.
The short answer
An MRSA skin infection is a skin or soft-tissue infection caused by methicillin-resistant Staphylococcus aureus. It usually starts as a painful red bump that grows quickly and may become a boil, abscess, or patch of cellulitis. About 80% of MRSA infections are confined to the skin; a small fraction become life-threatening when they reach the bloodstream or deeper organs.
Types of MRSA skin and soft-tissue infection
MRSA does not always look the same. The same bacterium can produce several distinct skin syndromes depending on where it enters the skin, how deep it goes, and the person’s immune response.
Folliculitis
Multiple small, itchy or tender pus-filled bumps centred on hair follicles. Often appears on the thighs, buttocks, or beard area. Shaving, friction, and contact sports raise the risk. Folliculitis can look like acne but is usually more inflamed and persistent.
Furuncle (boil)
A deep, painful, pus-filled lump that develops from an infected hair follicle. Boils are tense, red, warm, and often 2–5 cm across. They usually need incision and drainage to heal quickly.
Carbuncle
A cluster of connected boils with several drainage points. Carbuncles are larger, more painful, and more likely to cause fever and systemic symptoms than a single boil.
Abscess
A localised collection of pus under the skin, often with a thin, shiny overlying surface. The centre feels soft or fluctuant, and the surrounding area is red and warm. Larger abscesses almost always require drainage by a clinician.
Cellulitis
A spreading infection of the deeper skin layers. It appears as a warm, red, swollen patch with no clear border, often surrounding a wound or abscess. Red streaks tracking away from the area suggest lymphatic spread and need urgent treatment.
Impetigo
Shallow blisters or honey-coloured crusts, most commonly seen around the nose and mouth in children. MRSA impetigo looks identical to streptococcal impetigo; a swab is needed to distinguish them.
Wound infection
MRSA can infect surgical wounds, cuts, burns, or insect bites. Signs include increasing pain, redness, warmth, swelling, and purulent discharge after the first 48–72 hours of healing.
What MRSA skin infection looks like
The classic presentation is a tender red bump that is warm to the touch and develops a white or yellow pus-filled centre within 24–48 hours. It is often mistaken for a spider bite or a large pimple. The surrounding skin may be red and swollen, and red streaks tracking away from the lesion suggest the infection is spreading.
For a detailed visual guide to every stage, see What does MRSA look like? For a day-by-day progression, see the MRSA symptoms page.
Who is most likely to get MRSA skin infection
- People with frequent skin breaks: cuts, shaving nicks, eczema, or insect bites
- Athletes in contact sports, especially wrestlers and rugby players
- People who share towels, razors, clothing, or sports equipment
- Those living in close quarters: barracks, dormitories, prisons, and shelters
- Healthcare workers and recently hospitalised patients
- People with diabetes, weak immune systems, or prior MRSA colonisation
How MRSA skin infection is diagnosed
A clinician cannot reliably tell MRSA from other skin infections by appearance alone. Diagnosis is confirmed by a swab or sample sent for culture and antibiotic susceptibility testing. A rapid PCR nasal swab may check for MRSA colonisation, but the wound itself is the most useful sample. Blood tests are only needed if there are signs of invasive infection such as fever or spreading cellulitis.
How MRSA skin infection is treated
Incision and drainage is the cornerstone of abscess treatment. A clinician opens the abscess to release pus, which often produces rapid improvement even before antibiotics take full effect.
Antibiotics are added for cellulitis, surrounding infection, systemic symptoms, or recurrent disease. Common oral options include clindamycin, doxycycline, trimethoprim-sulfamethoxazole, and minocycline. Severe infections are treated in hospital with vancomycin, daptomycin, or linezolid. The exact drug depends on local resistance patterns, allergies, and whether the infection is improving.
Self-care while healing: keep the wound covered with a clean dry dressing, wash hands after touching the area, do not share towels or razors, and launder clothing and bedding in hot water. Avoid squeezing or lancing the lesion at home.
When skin MRSA becomes dangerous
Any MRSA skin infection can become invasive if the bacteria break through the skin barrier and enter the bloodstream. Warning signs include fever, chills, red streaks, rapidly spreading redness, severe pain, confusion, or shortness of breath. Once MRSA reaches the blood it can seed the heart valves, bones, joints, lungs, and brain.
Read the full guide to invasive MRSA for the conditions, mortality rates, and red flags that need an ER visit.
The conditions that follow have their own pages: MRSA bacteremia, MRSA pneumonia and MRSA sepsis.
Frequently asked questions
- CDC. Methicillin-resistant Staphylococcus aureus (MRSA): Information for clinicians (2024)
- NHS. MRSA — Treatment (2023)
- BMJ Best Practice. Staphylococcus aureus skin and soft tissue infection (2024)
- IDSA. Practice guidelines for the diagnosis and management of skin and soft tissue infections (2014)
Symptoms hub
Overview of MRSA symptoms and day-by-day progression.
What does MRSA look like?
Bumps, boils, abscesses and cellulitis — every visual form.
MRSA pneumonia
Hospital, ventilator-associated and necrotising lung infection.
MRSA bacteremia
MRSA in the bloodstream — how it gets there and how it's treated.
MRSA sepsis
Can MRSA cause sepsis? Warning signs and survival rates.
Invasive MRSA
How MRSA reaches the bloodstream, lungs and bone.
MRSA test
PCR nasal swab, wound culture and susceptibility testing.
MSSA vs MRSA
Same bacterium, different antibiotic susceptibility.