An infected pimple is noticeably larger than a regular breakout, often swollen and red, with yellow pus oozing or visible beneath the skin. It typically feels warm to the touch and hurts even when you’re not pressing on it. If your pimple has gone from a minor annoyance to something that looks angry and keeps growing, infection is the likely reason.
How It Differs From a Normal Pimple
A standard pimple forms when oil and dead skin cells clog a pore. It might have a small whitehead or blackhead, some mild redness, and a bit of tenderness if you poke at it. An infected pimple crosses into different territory. The bump is bigger and more prominent than a typical breakout, the redness spreads beyond the pimple itself, and the area swells in a way that a normal zit doesn’t.
The key differences you’ll notice:
- Size: Noticeably larger and puffier than a regular pimple, sometimes continuing to grow over a day or two.
- Color: Deep red or purplish skin around the bump, rather than the mild pink of a normal breakout.
- Pus: Yellow or greenish discharge that may ooze on its own or leak when touched. Normal whiteheads contain sebum, which is white or off-white. Yellow pus signals bacterial activity.
- Pain: Throbbing or aching without being touched, rather than tenderness only on contact.
- Warmth: The skin over and around the pimple feels warm compared to the surrounding area.
What Causes a Pimple to Get Infected
Most pimple infections happen when bacteria, usually Staphylococcus aureus, get pushed deeper into a clogged pore. Popping, squeezing, or picking at a pimple is the most common way this happens. Your fingers introduce bacteria from other surfaces, and the pressure can rupture the pore wall beneath the skin, spreading the contents into surrounding tissue.
Shaving over active breakouts, touching your face frequently, or using dirty makeup brushes can also introduce bacteria. Folliculitis, a related condition, is an infection that starts right at the base of a hair follicle. It looks like a tiny red or white pimple surrounding a hair and can crop up anywhere you have body hair. A specific form called “hot tub folliculitis” develops 6 hours to 5 days after sitting in a poorly chlorinated hot tub or whirlpool, typically appearing on the torso and buttocks where a swimsuit sat against the skin.
Infected Pimple vs. Skin Abscess
If an infected pimple keeps getting worse, it can develop into an abscess, a deeper pocket of pus beneath the skin. Most skin abscesses are caused by staph bacteria. They start as small red bumps that look like pimples or even spider bites, then deepen into painful, firm lumps that can grow to an inch or more. The skin over an abscess is taut and shiny, and the area may leak thick fluid.
Abscesses don’t resolve with surface-level care. They typically need to be drained by a healthcare provider who makes a small incision to release the trapped pus. Trying to squeeze an abscess at home pushes bacteria deeper and can make the infection significantly worse.
Infected Pimple vs. a Cyst
Cysts can look similar to infected pimples but behave differently. An epidermal cyst is a round, dome-shaped lump under the skin that ranges from about a quarter inch to over two inches across. It often has a small dark dot (called a punctum) in its center, and you can usually move it slightly with your fingers. When a cyst becomes infected, it turns red or darker than your natural skin tone, feels tender and warm, and may start draining.
The main distinction: cysts are deeper, more mobile under the skin, and tend to recur in the same spot because they have a sac wall that stays in place unless surgically removed. An infected pimple sits closer to the surface and doesn’t have that defined, movable quality.
When an Infection Becomes Serious
Most infected pimples stay localized and resolve on their own or with basic care. But bacteria can occasionally spread beyond the original site, and some warning signs deserve immediate attention.
Red streaks extending outward from the bump indicate the infection is traveling through your lymphatic system, a condition called lymphangitis. Other signs of spreading infection include swollen or tender lymph nodes near the area (in your neck, armpits, or groin depending on the pimple’s location), fever, chills, and a general feeling of being unwell.
A strain of staph bacteria called MRSA is resistant to many common antibiotics and can turn what looks like a simple pimple into a deep, painful abscess quickly. MRSA skin infections start as small red bumps that rapidly worsen, often producing thick drainage and sometimes fever. If a bump is growing fast, producing significant pain, or accompanied by fever, that warrants prompt medical evaluation rather than a wait-and-see approach.
How to Care for an Infected Pimple at Home
The American Academy of Dermatology recommends soaking a clean washcloth in hot water and applying it to the pimple for 10 to 15 minutes, three times a day. The warmth increases blood flow to the area, helps draw pus toward the surface, and can relieve some of the pressure and pain. After a few days of warm compresses, many infected pimples will drain on their own.
Resist the urge to squeeze. Compressing an infected pimple forces bacteria deeper into the skin and can spread the infection to surrounding tissue. Keep the area clean, avoid applying makeup or heavy products directly over it, and let it run its course. If the pimple isn’t improving after a week of home care, is getting larger, or the redness is spreading outward, a healthcare provider can evaluate whether you need a topical or oral antibiotic to clear the infection.