Scabies: the itch that is worse at night, and how to actually clear it
Last updated September 3, 2026.
Scabies is an infestation of tiny mites that burrow into the skin, and the hallmark is intense itching that is worst at night. The mite (Sarcoptes scabiei) spreads through prolonged skin-to-skin contact, so it moves through households, couples, care homes, and schools. It is not a sign of poor hygiene, anyone can catch it, and it does not go away without treatment. Symptoms can take 2-6 weeks to appear after a first infestation, which is why the source is often a mystery.
What does it look and feel like?
The itch is the main event: intense, and characteristically worse at night and after hot showers. The rash is small red bumps, blisters, and scratch marks, classically between the fingers, on the wrists, around the waistline and belt area, on the buttocks, around nipples, and on the genitals in men. The pathognomonic finding is a burrow: a thin, wavy, grayish line a few millimeters long, often with a tiny dot (the mite) at one end. In babies and toddlers, scabies can involve the head, palms, and soles, which is unusual in adults. In older adults and people with weakened immunity it can present atypically, sometimes as crusted scabies: thick, crusted, highly infested patches that are extremely contagious.
Why treatment fails
Most scabies treatment failures come from treating one person instead of everyone, or skipping the second application. The mite life cycle means eggs hatch after the first treatment, so guidelines call for a repeat application 7 days later. Household members and sexual partners need simultaneous treatment even without symptoms, because of that 2-6 week silent incubation. Bedding, clothing, and towels used in the prior 3 days should be hot-washed and hot-dried, or bagged for 72 hours; the mite survives off skin for only about 2-3 days, so fumigation is unnecessary.
What actually helps?
- Permethrin 5% cream: first-line. Apply from the neck down over the whole body (including soles, between fingers and toes, under nails, and the groin), leave on 8-12 hours (overnight), then wash off. Repeat in 7 days. In infants and the elderly, include the scalp and face, avoiding the eyes.
- Treat everyone at once: all household members and close physical contacts, the same night, symptom or not.
- Oral ivermectin: an option for outbreaks, crusted scabies, or when cream fails; two doses a week apart. Not for children under 15kg or in pregnancy.
- Manage the itch honestly: itch can persist 2-4 weeks after successful treatment (post-scabietic itch). This is the immune response fading, not failure. Emollients, oral antihistamines, and a mild steroid cream help while it settles.
- Decontaminate fabric, not rooms: hot wash and dry, or seal in bags for 72 hours. No sprays or foggers needed.
When is it an emergency?
Scabies itself is miserable but not dangerous. Escalate when scratching has broken the skin into infection: spreading redness, warmth, pain, pus, or fever needs same-day assessment for antibiotics. Crusted scabies (thick, scaly crusts, often in someone elderly or immunosuppressed) needs urgent specialist care because of the very high mite load. And if the itch is still intense more than 4 weeks after two correctly applied treatments, get reassessed rather than repeating cream indefinitely. Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper.
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Common questions
How do you catch scabies?
Through prolonged skin-to-skin contact, typically 15-20 minutes or more: sleeping in the same bed, holding a child, sexual contact. Brief contact like a handshake rarely transmits it. Less often it spreads through shared bedding or clothing, mainly when the infestation is heavy. Outbreaks cluster in households, care homes, and dormitories. Because symptoms can take 2-6 weeks to show after a first infestation, the timing rarely points at the source, and blame is usually misplaced.
Can you see scabies mites?
The mites themselves are barely visible: adults are about 0.3-0.4mm, at the edge of what the naked eye can resolve, and appear as a tiny dark or pale dot at the end of a burrow. What you can see clearly are the burrows (thin, wavy, grayish lines up to about 1cm) and the rash. Dermatologists confirm with dermoscopy or by scraping a burrow and finding mites or eggs under the microscope, but most diagnoses are made from the pattern of itch and rash.
Why am I still itching after treatment?
Post-scabietic itch is the rule, not the exception: itching commonly persists 2-4 weeks after the mites are dead because the immune reaction to mite debris takes time to fade. This does not mean treatment failed. Signs of actual failure are new burrows and new lesions appearing after day 7-10, or household contacts who were never treated. Manage the lingering itch with emollients, oral antihistamines, and a mild topical steroid, and re-treat only if new lesions appear.
Do I need to fumigate my house or throw away my mattress?
No. The scabies mite survives off human skin for only about 48-72 hours, so the decontamination list is short: hot-wash (50C/122F or hotter) and hot-dry bedding, clothing, and towels used in the 3 days before treatment, or seal items in plastic bags for 72 hours. Mattresses, carpets, and furniture need nothing beyond normal vacuuming. Insecticide sprays and foggers are unnecessary and are not recommended.
Is scabies dangerous for babies or during pregnancy?
Scabies is not dangerous in itself for either, but the treatment rules change. Permethrin 5% cream is considered the safe option in pregnancy and for infants over 2 months, applied from the neck down and including the scalp and face in babies. Oral ivermectin is avoided in pregnancy and in children under 15kg. Babies get scabies on the head, palms, and soles (unusual in adults), and the fussiness and poor feeding from the itch are often the presenting complaint.
Can scabies come back?
Yes, two ways. Reinfection from an untreated contact is the common one: an untreated partner or household member passes it back, which is why simultaneous treatment matters. True treatment failure happens when cream was not applied thoroughly (missed skin folds, under nails) or the second dose was skipped. After successful treatment, you can catch it again later from a new exposure; prior infestation gives no lasting immunity, though repeat infestations itch sooner.
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