Scabies is a skin infestation caused by a microscopic mite, Sarcoptes scabiei, that burrows into the upper layer of skin to live and lay eggs. In adults it's frequently passed through sex and close skin-to-skin contact. The hallmark is intense itching, worse at night, and a pimple-like rash. A prescription cream or pill clears it 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 |
What scabies actually is
Scabies isn't dirt, dryness, or an allergy to soap. It's a living infestation. The female human itch mite tunnels into the outermost layer of skin, where she lives, feeds, and deposits eggs along a burrow. The eggs hatch, the young mites mature, and the cycle continues on the same body. It's common worldwide and turns up across every income level and standard of hygiene.
The maddening itch isn't the mites biting you. It's an allergic immune reaction to the mites themselves and to the proteins in their feces and eggs left behind in the burrows. That explains why the itch is delayed at first, why it can feel worse before it gets better, and why it lingers even after every mite is dead.
Symptoms — and the silent reality
The defining symptom is relentless itching that flares at night, paired with a pimple-like, bumpy rash. If you look closely you may spot burrows, tiny raised slightly crooked lines where a mite has tunneled, sometimes ending in a minuscule blister or bump. They're easy to miss and easy to mistake for eczema or bug bites.
The rash favors specific real estate: the webs between the fingers, the wrists, the waistline, and the buttocks. In adults who acquired it sexually, the penis and genital area are classic sites. Itchy bumps clustered in these spots, worse at night, tell you more than any single bump.
After a first infestation, your immune system hasn't met this mite before, so symptoms typically take four to eight weeks to develop CDC. During that long quiet window you feel nothing, yet you can already pass it to a partner. That's why scabies spreads so efficiently, and why a partner can test the limits of "but I felt fine." For the full breakdown of where the rash shows and how the timeline plays out, see our guide to scabies symptoms.
How scabies spreads
Scabies moves through direct, prolonged skin-to-skin contact CDC. The mite crawls slowly from one person's skin to another's, which takes sustained contact rather than a passing touch. Sexual partners and people who share a bed or household are the usual chain of transmission.
A quick handshake or a brief hug generally won't transmit it; the contact is too short for the mite to make the trip. Less commonly, scabies spreads through shared clothing, towels, or bedding, because mites can survive a short time off the body. Crusted scabies (below) sheds enormous numbers of mites and spreads far more easily, including through brief contact and contaminated linens.
How scabies is diagnosed
Scabies is usually a clinical diagnosis, where a clinician recognizes the combination of burrows, the rash pattern, and the night-time itch in the typical locations CDC. When confirmation is needed, the clinician scrapes a small sample of skin from a burrow and examines it under a microscope, looking for mites, eggs, or mite feces. A positive scraping nails the diagnosis, but a negative one doesn't rule it out. The microscopic exam is less sensitive than the clinical picture, because there may be very few mites on a body.
In practice, the visit is quick: a focused skin exam, sometimes a scraping, and often a prescription that day, with no waiting on a lab to start relief. If you also want to rule out other infections picked up through sex, that's a separate, simple sample (a urine cup or a self-collected swab) with results back in a few days, often free or low-cost at a health department, Planned Parenthood, or a Title X clinic. Learn what to expect from scabies testing, and if you're sorting out timing for other exposures, see when to test after exposure.
How scabies is treated
Scabies doesn't clear on its own. It needs a prescription scabicide. The first-line treatment is permethrin 5% cream, applied to the whole body from the neck down and washed off after eight to fourteen hours CDC. An oral alternative is ivermectin dosed by body weight, repeated about two weeks later CDC STI guidelines. Your clinician picks based on your situation, including pregnancy, age, and how widespread the rash is.
Three rules make or break the outcome:
- Treat everyone at once — all sexual, close, and household contacts from the past month, even those without symptoms, since they may be in the silent window and will re-infect you otherwise.
- Decontaminate bedding, towels, and recently worn clothing: machine wash hot and dry on high heat, or seal items away from skin for about three days so any stray mites die off.
- Finish the full course exactly as directed, and avoid skin-to-skin contact until everyone is treated.
The itch will outlast the cure. Because it's an allergic reaction to mite proteins still embedded in the skin, it can persist for two to four weeks after successful treatment, which is normal and not a sign the medication failed. If new burrows appear or the itch worsens past that window, check back with your clinician. For a deeper look at how clearance actually works, read will scabies go away on its own? cure facts.
What happens if scabies goes untreated
Left alone, scabies persists and keeps spreading to the people closest to you. Constant scratching breaks the skin and opens the door to secondary bacterial infection — impetigo or deeper skin infections that may need antibiotics on top of the scabicide.
The most serious form is crusted (Norwegian) scabies, where the skin builds up thick, scaly crusts harboring an enormous mite population — up to about two million mites on a single person. It's seen mainly in elderly or immunocompromised people, including those with advanced HIV, whose immune systems can't hold the mites in check. Crusted scabies is extremely contagious and spreads through brief contact and contaminated surfaces, so it's an outbreak risk in households and care facilities, and it needs aggressive, specialist-guided treatment.
How to prevent scabies
Prevention comes down to limiting prolonged skin-to-skin contact with an infested person and treating the whole circle together so it can't bounce back. If a partner or household member is diagnosed, get treated at the same time rather than waiting to see if you itch. By the time you do, you've likely been spreading it.
For the sexually transmitted infections that often ride along with new partners, condoms used every time lower risk, and routine screening catches the infections that cause no symptoms at all. Condoms don't block scabies, since it spreads across the whole skin surface, so honest partner communication and prompt joint treatment do the heavy lifting. You can get tested for the rest at the same visit, and compare testing providers if you'd rather screen at home.
When to see a clinician
See a clinician if you have persistent itching that's worse at night, a new bumpy rash in the classic spots, or visible burrows, especially if a partner or housemate has been diagnosed. Don't try to self-treat with over-the-counter products; scabies needs a prescription, and the whole household has to be coordinated. A scabies diagnosis is common, the clinics that handle it do so routinely, and it says nothing about you as a person. It's a mite, and it's treatable.
Seek care sooner if you're pregnant, immunocompromised, caring for an infant, or seeing crusted, scaly patches or signs of skin infection like increasing redness, warmth, pus, or fever.