Mpox symptoms center on a rash that looks like pimples or blisters — often painful or itchy — that can show up on the genitals, anus, mouth, hands, feet, or face. Since 2022, many people get just one or a few sores in the anogenital area instead of a full-body rash. Fever, swollen lymph nodes, and muscle aches may come first, or not at all CDC.
with the right treatment
testing, not symptoms, decides
| Item | Value |
|---|---|
| Curable? | yes — with the right treatment |
| Tested by | exam + lab |
| If you may have it | get tested — testing, not symptoms, decides |
The symptoms of mpox, explained
Mpox is caused by the monkeypox virus, a relative of the smallpox virus. The clade II strain drove the global outbreak that began in 2022, spreading mainly through close skin-to-skin contact — including intimate and sexual contact — and affecting mostly men who have sex with men CDC, About Mpox. The hallmark of infection is the rash, but it travels with a cluster of whole-body symptoms worth knowing in detail.
- The rash is the defining sign. Lesions start flat, raise into firm bumps, fill with clear or yellowish fluid, then crust over and scab before healing. They can look exactly like pimples or fluid-filled blisters, and they're frequently painful or intensely itchy rather than harmless-looking.
- Fever, chills, and exhaustion often arrive as a prodrome — the early flu-like phase before the rash — though some people get the rash with no warning at all.
- Swollen, tender lymph nodes (the bean-sized immune glands in the neck, armpit, or groin) are a classic clue that helps separate mpox from ordinary skin breakouts; the swelling reflects the immune system reacting to the virus.
- Muscle aches, headache, and a general run-down feeling are common.
- Respiratory symptoms — sore throat, congestion, or cough — can accompany the illness, especially when lesions involve the mouth or throat.
Where the lesions show up — and the signs that are easy to miss
In the current sexually transmitted pattern, the rash often appears right where contact happened: the genitals, the anus, or inside the mouth. That's a sharp departure from the older textbook picture of a rash that spreads across the whole body. Many people now develop only a single lesion or a small handful, which makes it easy to dismiss as a razor bump, an ingrown hair, or a single pimple.
Some of the most uncomfortable presentations are also the least obvious from the outside. Lesions inside the rectum can cause proctitis (inflammation of the rectum that brings pain, the urge to pass stool with little result, and sometimes bleeding) without any visible sore. Sores in the mouth or throat can make swallowing painful. A lesion tucked into the genital folds or the anal area may be felt before it's seen. Because the rash can be limited and hidden, the absence of an obvious spreading rash does not rule mpox out.
How soon symptoms appear after exposure
The incubation period runs about 3 to 17 days, and people usually become sick within 21 days of contact. Once symptoms begin, the illness typically lasts 2 to 4 weeks, with lesions crusting and shedding scabs before the skin heals over. A person is generally considered contagious from when symptoms start until every lesion has scabbed, fallen off, and grown a fresh layer of skin.
If you've had a recent exposure and want to coordinate testing for other infections at the same time, our guide on when to test after exposure explains how incubation windows differ across STIs so you don't test too early for the wrong thing.
What people commonly mistake mpox for
A single painful or itchy anogenital sore overlaps with a long list of more familiar conditions, which is exactly why guessing fails so often. People most frequently confuse early mpox with:
- Genital herpes — herpes produces grouped, painful blisters that ulcerate, and the resemblance can be striking.
- Syphilis — a primary syphilis chancre is usually a single firm sore, sometimes painless, in the same regions.
- An ingrown hair, folliculitis, or an ordinary pimple — easy to assume when there's just one bump.
- Molluscum contagiosum — small, dome-shaped bumps that can mimic early mpox lesions.
- Hemorrhoids or a fissure — when rectal pain and bleeding from proctitis are the main complaint.
These conditions overlap too much to tell apart by sight alone, and several of them are frequently silent. The bottom line is practical: a test, not the look of the sore, is what settles which one it is — if any.
How mpox is confirmed
Mpox is confirmed by detecting the virus's DNA with a PCR test run on a swab taken directly from a suspected lesion — not a blood draw and not a urine sample. A clinician firmly swabs the sore to collect material, which goes to a lab. For the full step-by-step on the swab, what the visit involves, and how results come back, see our page on mpox testing.
Because mpox can travel alongside other sexually transmitted infections — and because what looks like mpox may turn out to be herpes or syphilis — it's reasonable to get tested for the common STIs at the same visit. Depending on what's suspected, that may mean a urine sample, a self-collected swab, or a quick exam; testing is free or low-cost at health departments, Planned Parenthood, and Title X clinics, with results usually back in a few days.
When to see a clinician
See a clinician promptly if you develop a new rash or sore — especially in the genital, anal, or oral area — after close or intimate contact, or if you've had contact with someone diagnosed with mpox. Don't wait for the rash to spread; the current pattern is often just one or a few lesions. Cover the area and avoid skin-to-skin and sexual contact until you've been evaluated, since mpox is contagious while lesions are present.
Most people without severe disease recover with supportive care and pain management. The antiviral tecovirimat (TPOXX) is considered for severe disease or for people at high risk — such as those with advanced HIV — through a CDC access program; trials found it safe, but it did not speed lesion healing CDC, mpox treatment. Seek care urgently for uncontrolled pain, sores in the eye, trouble swallowing, signs of a skin infection (spreading redness, warmth, pus), or if you're immunocompromised, since mpox can be severe in those cases.