In short
Scabies is an intensely itchy mite infestation that needs everyone in the household treated on the same day, twice, a week apart. Itching for weeks afterwards is expected and does not mean the treatment failed.
Emergency if: Spreading redness, swelling, pus, or fever from scratched skin — a bacterial infection on top of scabies needs urgent treatment.
On your report
Absolute Eosinophil Count, Total IgE, WBC / Total Leukocyte Count, CRP
On this page
01
What scabies is
Scabies is caused by a tiny mite that burrows into the outer layer of skin and lays eggs there. The rash and the itch are largely an allergic reaction to the mites and their waste rather than damage from the burrowing itself, which explains the two most confusing features of the condition: the delay before symptoms start, and the itch that persists after the mites are dead.
In a first infestation it can take several weeks for the reaction to develop, so a person is infectious before they have any idea they are carrying it. Someone who has had scabies before reacts within days, because the immune system already recognises it.
02
Recognising it
The hallmark is itch that is far worse at night and severe out of proportion to how the rash looks. The rash is typically small red bumps, sometimes with fine wavy burrow lines, and it favours the finger webs, wrists, elbows, armpits, waistline, buttocks, genitals, and the skin under the breasts.
In adults it usually spares the head and neck. In babies, young children and older adults it can involve the scalp, face, palms and soles, which is why scabies is missed in exactly the groups where it spreads fastest. More than one itchy person in a household is a strong clue and should prompt suspicion even when a rash is unimpressive.
03
Treatment: everyone, same day, twice
Treatment is a cream or lotion applied over the whole body, including the scalp and face apart from the area around the eyes. Whole-body means whole body: between the fingers and toes, under the nails, in the navel, the genitals and the soles. Missed areas are where the infestation survives. It is left on for the stated number of hours before washing off, and reapplied if hands are washed during that time.
The treatment is repeated 7 days later, because it does not reliably kill eggs and the second application catches the mites that have since hatched. Both applications matter — stopping after one is a common reason scabies persists. Children under 2 should not be given pharmacy treatments and need a doctor's advice instead.
04
Treating the household is not optional
Everyone in the household must be treated at the same time, whether or not they itch, because the weeks-long delay before symptoms means untreated contacts are almost certainly already infested. Anyone you have had sexual contact with in the past 8 weeks should also be treated.
Treating people on different days is the classic failure: those treated first are reinfested by those treated later, and the household cycles indefinitely. Agreeing one evening when everybody treats together is worth the organising it takes.
05
Why the itch carries on
Although the treatment kills the scabies mites quickly, the itching can carry on for a few weeks. The allergic reaction in the skin subsides slowly, and it does not indicate that the treatment failed or that you have been reinfested. Repeating the treatment again and again because of ongoing itch irritates the skin further and is a genuinely common mistake.
Soothing measures help in the meantime: moisturiser, an antihistamine at night, cool rather than hot showers, and a mild steroid cream if a doctor advises it. Signs that would suggest genuine treatment failure are new burrows appearing, new people in the household becoming itchy after a few weeks, or itch that is clearly worsening rather than slowly settling after a month.
06
Bedding, clothes and crusted scabies
Mites survive only a short time away from skin. Wash clothing, bedding and towels used in the days before treatment on a hot wash and dry thoroughly; anything that cannot be washed can be sealed in a bag for a few days. Fumigating the house or deep-cleaning furniture is not necessary and adds nothing.
Crusted scabies is a rare, far more contagious form affecting people whose immune systems are suppressed. It produces a crusted, flaky rash that often affects the elbows, knees, hands and feet, and it carries enormous numbers of mites. It needs specialist treatment, usually combining oral and topical medicines, and strict infection control.
When to act
Routine — see a doctor
Itch continuing for two to four weeks after correct treatment with no new burrows: this is expected, and needs soothing care rather than repeat treatment.
Same-day — call promptly
Scabies in a baby under 2, in pregnancy, or a crusted flaky rash in someone with a weakened immune system.
Emergency — act now
Spreading redness, swelling, pus, or fever from scratched skin — a bacterial infection on top of scabies needs urgent treatment.
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Sources
- Scabies — NHSnhs.uk
- Scabies — World Health Organizationwho.int
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