Scabies looks like a pimple-like, intensely itchy rash, often with tiny crooked, raised lines called burrows where the mite has tunneled into the skin. Itching is worst at night. Classic hotspots include the webbing between fingers, the wrists, the penis, the waistline, and the buttocks. Crusted scabies forms thick, scaly plaques instead.
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 |
What scabies actually is
Scabies is an infestation by the human itch mite, Sarcoptes scabiei, a microscopic creature that burrows into the upper layer of skin to live and lay eggs CDC, About Scabies. The rash and itch you see and feel aren't from the mite directly so much as your immune system reacting to the mites, their eggs, and their waste under the skin. It's common worldwide, and in adults it's frequently passed through sustained skin-to-skin contact during sex, which is why it sits alongside other STIs even though it isn't a bacterium or virus.
What the symptoms look and feel like
The hallmark is itching out of proportion to what you see — and it's classically worse at night, when warmth and stillness seem to rev up the reaction. The rash itself is a scattering of small, pimple-like bumps that may be red, crusted from scratching, or filled with a tiny bit of fluid. People often describe it as a relentless, crawling itch that no amount of moisturizer touches.
The single most specific finding is a burrow: a tiny, raised, grayish or skin-colored crooked line, often only a few millimeters long, marking the tunnel the female mite has dug. Burrows are easy to miss because scratching tears them up, but when you spot one in a typical site, it's close to diagnostic CDC, Scabies signs & symptoms.
- Intense itching, especially at night, that interferes with sleep.
- A pimple-like rash — small bumps that can look like acne, bug bites, or hives.
- Burrows: thin, crooked, raised lines, sometimes with a tiny dark dot at one end.
- Scratch marks, scabs, and thickened skin in areas you've been clawing at for weeks.
Where the rash shows up — and the spots people miss
Mites prefer warm, thin-skinned, folded areas. The classic map is the web of skin between the fingers, the wrists, the penis, the waistline, and the buttocks. In sexually transmitted cases, the genitals are a key clue — itchy bumps on the shaft of the penis or scrotum should always raise scabies as a possibility.
Less obvious sites trip people up. Check the inner wrists and the creases of the elbows, the front of the armpits, around the belt line, the navel, the breasts (especially under and around the nipples), the inner thighs, and the buttock fold. In adults the head and neck are usually spared, but in infants, the elderly, and people who are immunocompromised, the scalp, face, palms, and soles can be involved — a pattern that surprises clinicians who only think of scabies below the neck.
How soon symptoms appear after exposure
Timing is the part that fools almost everyone. After a first-ever infestation, symptoms typically take 4 to 8 weeks to develop, because your immune system needs time to become sensitized to the mites. During that silent stretch you can already spread scabies to others without any rash or itch of your own. If you've had scabies before, your immune system reacts much faster — sometimes within days of re-exposure — so a second round can flare almost immediately.
That long, symptom-free window is why partner notification matters and why the timing of contact can be confusing. If you're trying to line up when you were exposed against when to look for other infections, see our guide to when to test after exposure.
What people mistake scabies for
Because the rash is just "itchy bumps," it's commonly blamed on the wrong thing for weeks. The differential a clinician runs through includes eczema (which is itchy but usually chronic and patchy in known spots), bed bug or flea bites (which favor exposed skin and come in lines or clusters), folliculitis or acne, contact dermatitis from a new soap or detergent, and hives. The distinguishing features are the location pattern (finger webs and genitals), the nocturnal itch, the presence of burrows, and a household or sexual partner who's also itching.
For a side-by-side breakdown of the tell-tale differences, see scabies vs bed bugs vs eczema. The single most useful question is whether anyone you live with or sleep with is also scratching — scabies travels in clusters.
Classic vs. crusted (Norwegian) scabies
Most cases are "classic" scabies, where a relatively small number of mites cause the itchy bumps and burrows described above. Crusted (Norwegian) scabies is a far more severe, extremely contagious form in which the skin carries up to about 2 million mites, producing thick, gray, crumbling crusts and scaly plaques rather than scattered bumps. It's seen mainly in elderly people and those with weakened immune systems, including people with advanced HIV, whose immune response can't keep the mite population in check. Notably, crusted scabies may itch less even though it's vastly more infectious — the crusts shed mites that can spread through brief contact or contaminated bedding.
| Classic scabies | Crusted (Norwegian) scabies | |
|---|---|---|
| Mite burden | Relatively few mites | Up to about 2 million mites |
| Appearance | Scattered itchy bumps, burrows | Thick gray crusts, scaly plaques |
| Itch | Intense, worse at night | Sometimes mild despite severity |
| Who gets it | Otherwise healthy adults | Elderly, immunocompromised, advanced HIV |
| Contagiousness | Needs prolonged contact | Extremely contagious, brief contact |
Complications if scabies is left untreated
Scabies won't clear on its own, and the longer it goes the more it spreads — to sexual partners, household members, and back to you. The most common direct complication is secondary bacterial skin infection: weeks of scratching break the skin and let bacteria like staph or strep in, causing impetigo (crusted, oozing sores) or cellulitis (a spreading, painful skin infection) CDC, clinical overview. In some cases those skin-infecting bacteria can lead to deeper problems, which is why secondary infection isn't something to wait out.
Crusted scabies in particular tends to be missed or misdiagnosed, allowing massive mite numbers to build and seed outbreaks in households and care facilities. Getting on the right scabies treatment promptly is what stops both the itching and the spread.
Who should get checked
You should be evaluated if you have unexplained, persistent itching — especially at night — with a bumpy rash in the typical spots, or if a sexual partner or household member has been diagnosed. Because the mite spreads before symptoms appear, everyone in close contact is usually treated at the same time even if they don't itch yet, which is the public-health logic behind treating whole households together CDC STI Tx Guidelines. People with weakened immune systems should be checked early because of their crusted-scabies risk.
How scabies is diagnosed
Diagnosis is usually a quick visual exam — a clinician looks for burrows and the classic distribution, sometimes confirming by scraping a burrow to look for mites or eggs under a microscope; results are typically same-visit or back within a few days. It's free or low-cost at health departments, Planned Parenthood, and Title X clinics. If you're sorting out scabies alongside other exposures, you can get tested for STIs at the same visit.
When to see a clinician
See a clinician if itching and a rash persist beyond a couple of weeks, if a partner or housemate has scabies, if the skin becomes painful, red, warm, or starts oozing (signs of secondary infection), or if you develop thick crusted patches. A scabies diagnosis is common and entirely treatable — clinics handle it daily, and it says nothing about you as a person. After treatment, follow the steps for avoiding scabies reinfection, since untreated contacts and bedding are the usual reason it comes back.