MMRSA Guide
Microscopic illustration of MRSA (Staphylococcus aureus) bacteria
Reference · Symptoms · Conditions

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.

Reviewed and updated by the MRSA Guide editorial team.

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 direct comparison, see staph infection vs pimple, and if you are wondering whether MRSA shows up as a rash, see MRSA rash.

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

What is an MRSA skin infection?
An MRSA skin infection is a skin or soft-tissue infection caused by methicillin-resistant Staphylococcus aureus — a type of staph bacterium that has become resistant to many common antibiotics, including methicillin and flucloxacillin. Most MRSA skin infections start as a painful red bump and may progress to a boil, abscess, or cellulitis.
Is MRSA skin infection contagious?
Yes. MRSA spreads through skin-to-skin contact and by sharing contaminated items such as towels, razors, or sports equipment. A person with an active MRSA skin infection is most contagious while the wound is draining or uncovered. Covering the wound and practising hand hygiene sharply reduces the risk.
How long does an MRSA skin infection last?
With proper treatment, a small MRSA boil or abscess usually improves within 48 to 72 hours after incision and drainage, and antibiotics are continued for 5 to 14 days depending on severity. Larger abscesses, cellulitis, or infections in people with diabetes or weak immune systems can take several weeks to resolve.
Will MRSA skin infection go away on its own?
A very small lesion might drain and settle without antibiotics, but most MRSA skin infections need medical treatment. Delaying care increases the risk of the infection spreading to deeper tissue, causing scarring, or seeding the bloodstream. Any rapidly enlarging, painful, or pus-filled lesion should be checked by a clinician.
What antibiotics are used for MRSA skin infection?
For outpatient skin infections, clinicians typically use clindamycin, doxycycline, trimethoprim-sulfamethoxazole (TMP-SMX), or minocycline. Severe infections requiring hospital treatment are often given vancomycin, daptomycin, or linezolid. Choice depends on local resistance, allergy history, and whether the infection has entered the bloodstream.
Can MRSA skin infection spread to other parts of the body?
Yes. If MRSA breaks through the skin barrier it can enter the bloodstream and travel to bones, joints, heart valves, lungs, or the brain. Warning signs include fever, chills, red streaks spreading from the wound, rapidly spreading redness, confusion, or shortness of breath.
What is the difference between MRSA and a staph skin infection?
MRSA and MSSA are the same bacterium — Staphylococcus aureus — but MRSA is resistant to beta-lactam antibiotics such as methicillin, flucloxacillin, and cephalexin. The symptoms look identical; the difference is which antibiotics will work. A culture is needed to tell them apart.
Do I need to be hospitalised for MRSA skin infection?
Most MRSA skin infections can be treated in primary care or an urgent care clinic. Hospitalisation is needed for severe cellulitis, large or deep abscesses, fever or signs of sepsis, infections on the face, immunocompromised patients, or any infection that is not improving on oral antibiotics.

Treatment in detail

Drainage, which oral antibiotics work, treatment length and what to do about recurrence are set out on the MRSA skin infection treatment page.

References
  1. CDC. Methicillin-resistant Staphylococcus aureus (MRSA): Information for clinicians (2024)
  2. NHS. MRSA — Treatment (2023)
  3. BMJ Best Practice. Staphylococcus aureus skin and soft tissue infection (2024)
  4. 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 rash

Does MRSA cause a rash? Look-alikes and how to tell them apart.

MRSA in the nose

Nasal carriage vs infection, swab testing and mupirocin treatment.

MRSA boil

Deep, painful, pus-filled lumps and how they are drained.

MRSA cellulitis

Spreading deeper-skin infection and urgent warning signs.

MRSA folliculitis

Small pus-filled bumps around hair follicles and prevention.

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.

Staph infection vs pimple

How to tell a normal pimple from a staph or MRSA skin lesion.

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