Scabies: Symptoms, Treatment and Why the Whole Family Needs It

Scabies is an intensely itchy skin infestation caused by a tiny mite that burrows into the top layer of skin, and the classic sign is itching that is much worse at night, often affecting several people in the same home. It is curable, but only if everyone in close contact is treated at the same time and clothes, towels and bedding are washed, otherwise the mites keep passing back and forth.

In India, scabies is very common in hostels, joint families, schools and crowded housing. Many families go through months of itching because one person is treated at a time, or because the rash is mistaken for an allergy, fungal infection or heat rash.

What causes scabies and how does it spread?

Scabies is caused by a mite called Sarcoptes scabiei. It is too small to see with the naked eye. The female mite burrows into the skin, lays eggs, and the body reacts to the mites and their waste with intense itching.

It spreads mainly through:

• Prolonged skin to skin contact, such as sleeping in the same bed, caring for a child, or close contact between partners
• Sharing clothes, towels and bedding, especially in crowded conditions

A quick handshake is unlikely to pass it on. The World Health Organization notes that scabies is most common in crowded, resource limited settings and among young children, and that it can lead to skin infections and other complications if left untreated.

An important point: after a first infestation, it can take a few weeks before itching starts. During that time a person can already spread mites without knowing it.

What are the symptoms of scabies?

• Severe itching, worse at night or after a warm bath
• Small red or dark bumps, sometimes with scratch marks, crusts or tiny blisters
• Burrows, fine wavy grey or skin coloured lines, often between the fingers or on the wrists
• Typical sites: finger webs, wrists, elbows, armpits, waist, around the navel, buttocks, thighs, genitals, and around the nipples in women
• In men, itchy bumps on the penis and scrotum are a strong clue
• In babies and young children, the rash can also appear on the palms, soles, face and scalp

On brown skin, the bumps may look dark brown or purple rather than red, and the itching often leaves dark marks.

Crusted scabies

A rare, severe form called crusted scabies can occur in elderly people, people with weakened immunity, or people who cannot feel or scratch normally. The skin becomes thick and crusted with very large numbers of mites. It is highly contagious and needs urgent medical care.

How is scabies diagnosed?

A dermatologist can usually recognise scabies from the pattern of itching, the location of the rash and the fact that others at home are affected. Sometimes your doctor may look closely with a dermatoscope or take a gentle scraping to look for mites or eggs under the microscope.

Scabies is often confused with:

Condition	How it differs
Fungal infection (ringworm)	Ring shaped patches with a scaly edge, not usually in finger webs
Eczema	Dry, rough patches, often in skin creases, family history of allergy
Insect bites	Scattered bumps on exposed skin, not burrows
Urticaria (hives)	Raised welts that move around within hours
Prickly heat	Tiny bumps in sweaty areas, improves with cooling

Applying steroid creams to undiagnosed scabies can temporarily reduce itching while the mites keep multiplying, which can make the rash more widespread and harder to recognise.

How is scabies treated?

Scabies needs prescription treatment. Your dermatologist may prescribe a scabicide lotion or cream applied to the whole body, or in some situations an oral medicine. The choice depends on age, pregnancy, breastfeeding, the extent of the rash and other health conditions. Some treatments are not suitable for infants or pregnant women, so please do not use a product prescribed for another family member without checking.

General principles your doctor will explain:

• Apply to the whole body, usually from the neck down, including between fingers and toes, under the nails, the genitals and the soles. In infants and the elderly, the scalp and face may also need treatment.
• Leave it on for the recommended time before washing off.
• Reapply to the hands if you wash them during the treatment period.
• A second application is often advised after a set interval, because the first may not kill all eggs.

In India, studies of mass treatment with oral medication in tribal communities have shown that treating whole communities together can sharply reduce scabies, which underlines the same principle at home: treat everyone together.

Why must the whole family be treated at the same time?

This is the single most common reason scabies fails to clear.

• Family members may have mites without any itching yet.
• If one person is treated this week and another next week, the mites pass back to the first person.
• Everyone who shares a bed, a room or has close contact should be treated on the same day, even if they have no symptoms, as advised by the doctor.

This includes domestic help who live in, grandparents, and children who share a bed with parents.

How should clothes, bedding and the house be cleaned?

On the day of treatment:

1. Wash all clothes, towels and bedsheets used in the previous few days in hot water, and dry them in strong sunlight or a hot dryer.
2. Seal items that cannot be washed, such as soft toys, shawls or blankets, in a plastic bag for several days, as advised by your doctor. Mites cannot survive long away from human skin.
3. Vacuum or sweep mattresses, sofas and carpets.

There is no need for pesticide sprays in the house. They do not treat scabies and can be harmful.

Why does itching continue after treatment?

It is normal for itching to continue for two to four weeks after successful treatment, because the skin is still reacting to dead mites. This is often mistaken for treatment failure, leading people to apply scabicide again and again, which irritates the skin.

Your dermatologist may suggest a gentle moisturiser and sometimes an antihistamine or other measures to calm the itch. See your doctor again if:

• New burrows or new bumps appear after two weeks or so
• Itching is getting worse rather than slowly better
• Signs of infection appear, such as pus, crusting or fever

Is scabies common in children, and what about school?

Scabies is common in babies and children, especially in crowded homes, hostels and boarding schools. Babies may be irritable and feed poorly due to itching. Children can usually return to school after the first full treatment, as advised by the doctor. Teachers and hostel wardens should be informed so that other children with itching can be checked. If your child also has dry, itchy skin, our guide to eczema in adults and children explains how to tell the two apart.

Are home remedies useful for scabies?

Neem baths, sulphur soaps, kerosene and antiseptic liquids are often tried in India. Most are not reliable at killing mites, and harsh liquids can cause burns and irritant dermatitis, particularly in children. Avoid steroid creams, which can mask the rash. Our article on topical steroid misuse explains why.

If you are unsure whether your rash is scabies or a fungal infection, our ringworm guide describes how tinea typically looks.

When to see a dermatologist

See a dermatologist if:

• You or your child have itching that is worse at night, especially if others at home are itching too.
• Itching continues or new bumps appear several weeks after treatment.
• The rash has pus, crusts, swelling or fever.
• A baby, pregnant woman, elderly person or someone with low immunity is affected.
• The skin is thick and crusted.

Scabies is curable, and with the right plan the whole household can be itch free. Dr. Maria offers online consultations to help confirm the diagnosis and plan safe treatment for every member of the family.