Scabies

Scabies is an intensely itchy rash caused by a delayed allergic reaction to the mite Sarcoptes scabiei, its eggs and its faeces. The female mite burrows into the top layer of the skin (Siegfried & Hebert, J Clin Med 2015; DermNet 2025). It spreads through prolonged close skin contact, which makes family cuddling and nursery play the usual routes in toddlers. Spread via clothing or bedding is uncommon except in crusted scabies. It has nothing to do with poor hygiene (NHS; DermNet). After a first infection, itch takes 4–6 weeks to appear, and the person is infectious during that time. The NHS says the rash can take up to 8 weeks. So by the time a toddler is itching, other family members may already be infected but not yet symptomatic (DermNet; NHS).

Scabies [part-of] Differential Diagnosis of Toddler Eczema Scabies [relates] Itch-Scratch Cycle

How it looks in babies and toddlers. In adults the neck and head are spared. In infants and young children the rash commonly involves the palms, soles, face and scalp (Siegfried & Hebert 2015; NHS; DermNet). Look for:

• itch that is worse at night and that other household members share, starting at a similar time (Türe Avcı et al., Children 2026; Napolitano et al., Dermatol Ther 2022);
• small red papules, blisters or pustules on the palms and soles, and fine grey wavy burrows (5–10 mm) on the hands, the sides of the feet, the wrists and the finger and toe webs (DermNet);
• firm red-brown nodules in the armpits, groin, buttocks or on the genitals. These are a dominant feature in children and can persist for months after successful treatment (DermNet, nodular scabies);
• a widespread secondary eczematous rash on the trunk and limbs that can hide the classic signs (DermNet). Older children show the adult pattern of finger webs, wrists, armpits and groin, which are not typical eczema sites (Napolitano 2022). Diagnosis is confirmed by dermoscopy (“delta-wing jet” sign) or a skin scraping showing the mite, eggs or faeces. Examining itchy contacts often finds signs that the child’s skin hides (DermNet; Türe Avcı 2026). The 2020 IACS consensus criteria require eczema to be considered less likely before diagnosing clinical or suspected scabies (DermNet).

Scabies [contradicts] Atopic Dermatitis

Why it gets mistaken for eczema, and how the two interact. Scabies in a child with Atopic Dermatitis is easy to miss. Children with AD react more strongly to the mite, and the secondary eczema can dominate the picture (Siegfried & Hebert 2015). Published cases describe scabies mimicking a relapsing AD flare (Pigliacelli et al., Dermatol Rep 2024, cited by Türe Avcı 2026). If the rash is treated as eczema with Topical Corticosteroids, it may look better while the mites keep multiplying. This is “scabies incognito”, and it can delay diagnosis for months or years (DermNet; Siegfried & Hebert 2015). The permethrin product information therefore advises withholding corticosteroid treatment of eczema-like reactions before permethrin, because suppressing the immune response can worsen the infestation (emc SmPC). Scabies also makes existing eczema worse, and scratched skin can become infected with Staphylococcus aureus or Streptococcus, producing Impetigo (NHS; DermNet). Clues that should make parents and clinicians think of scabies are: a toddler’s “eczema” that suddenly worsens and stops responding to usual treatment, new spots on the palms and soles, a new night-time itch, or other family members itching.

Steroid escalation on unexplained itch

Stronger steroid creams on undiagnosed scabies hide it without treating it (“scabies incognito”). If a toddler’s eczema flares unusually, with itchy relatives or palm and sole spots, have the child assessed for scabies before stepping up steroids.

Topical Corticosteroids [worsens] Scabies Scabies [worsens] Atopic Dermatitis Scabies [causes] Impetigo

Treatment in toddlers. First-line treatment is Permethrin 5% cream. It is licensed in the UK for children from 2 months of age, and the FDA likewise approves it from 2 months (emc SmPC; CDC). Experience between 2 and 23 months is limited, so under-2s should be treated only under medical supervision. The NHS says pharmacy treatment should not be used in under-2s and these children should see a GP. Key points from the SmPC, DermNet and the NHS:

• Under-2s: apply to the whole body, including the scalp, neck, face and ears, but avoid the eyes and the area around the mouth, where cream could be licked off. Put mittens or gloves on the child to stop hand-licking. CDC’s general “neck down” instruction is for adults and older children.
• Pay particular attention to the finger and toe webs, under the nails, the wrists, armpits, groin, buttocks and the soles of the feet. Leave the cream on for 8–12 hours (overnight), and reapply to the hands if they are washed.
• Repeat after 7 days (NHS; DermNet: 7–10 days). Infants who kick and clench their fists may need targeted reapplication to the hands and feet on 3 consecutive days (DermNet).
• Everyone in the household and all close contacts must be treated at the same time, even without symptoms. Untreated contacts are the usual cause of reinfection (NHS; DermNet).
• On the first day, wash bedding, towels and clothes at 60°C or hotter. Seal unwashable items in a bag for at least 3 days (NHS). Children under 5 can return to nursery 24 hours after the first treatment (NHS). Alternatives for treatment failure, under specialist advice, include benzyl benzoate, malathion and oral ivermectin. French guidance (2024) considers ivermectin an option from 2 months, but it is not FDA-approved for scabies (DermNet; CDC).

Permethrin [treats] Scabies

After treatment. Itch and rash commonly persist for 2–4 weeks, and this does not mean treatment has failed (SmPC; NHS; DermNet). This is when eczema care becomes useful again. Regular emollients and soap avoidance, and if needed a short course of a topical steroid for the post-scabetic eczematous reaction, help settle the skin. DermNet suggests moderate potency for 3–4 weeks for a widespread reaction, and toddlers’ prescriptions are tailored by the clinician. Oral Antihistamines help some children sleep (DermNet). Nodules may persist for months. The NHS advises returning to the GP if itching continues 2–4 weeks after treatment has finished, or if the skin looks infected.

Emollient Therapy [treats] Scabies Oral Antihistamines [relates] Scabies Scabies [precedes] When to Refer

Connections

• Differential Diagnosis of Toddler Eczema — infestation mimic of AD, source: Siegfried & Hebert 2015
• Atopic Dermatitis — AD children react more strongly; scabies mimics relapsing AD and worsens eczema, source: Siegfried & Hebert 2015; NHS
• Topical Corticosteroids — masks scabies (incognito); withhold before permethrin; used after for post-scabetic eczema, source: DermNet; emc SmPC
• Permethrin — first-line, licensed from 2 months; under-2s under medical supervision, source: emc SmPC; CDC
• Impetigo — secondary bacterial infection from scratching, source: NHS; DermNet
• Staphylococcus aureus — secondary infection organism, source: DermNet
• Emollient Therapy — post-scabetic itch care, source: DermNet
• Oral Antihistamines — help some with post-scabetic itch, source: DermNet
• Itch-Scratch Cycle — nocturnal itch drives scratching and infection, source: NHS
• When to Refer — under-2s need a GP; persistent itch 2–4 weeks after treatment, source: NHS