Scabies

Scabies: Symptoms, Diagnosis and Treatment

Scabies is a contagious skin infestation caused by a microscopic mite called Sarcoptes scabiei. Its main sign is intense itching that gets worse at night.

What Is It?

The female mite digs burrows in the upper layer of the skin and lays her eggs there. It spreads through prolonged direct skin-to-skin contact — for example, sleeping in the same bed — and less often through bed linen and clothing.

The itching does not start right away. With a first infestation it appears after 2–6 weeks, because the body needs time to develop a reaction to the mite and its waste. With a repeat infestation it starts within 1–4 days. This means a person is contagious before the itching begins — and can pass it on to the rest of the household without knowing.

Symptoms

• Severe itching that is clearly worse at night

• Red, raised rash

• Thin, gray-white, wavy lines (burrows)

• Scratch marks, crusting and secondary infection

• Small blisters (vesicles)

• Thickened, scaly skin when the condition lasts longer

Why Is It Worse at Night?

The mite is more active at night. The rise in body temperature under the covers and the absence of distractions also play a part. Night-time itching that gets people out of bed is one of the most typical signs of the disease, and it is the complaint that brings most patients to a doctor.

Commonly Affected Areas

• Between the fingers

• Wrists and ankles

• Inner elbows

• Armpits

• Waist and abdomen

• Genital area in men

• Under the breasts in women

• In babies and young children, also the scalp, face, palms and soles. This matters for treatment: in children under 2 the medication is also applied to the head and face, whereas in adults it is not.

How It Spreads

• Prolonged direct skin-to-skin contact

• Sharing a bed and bed linen

• Sharing clothes

• Sharing towels and bath sponges

A brief handshake or hug is usually not enough for transmission; prolonged contact is needed.

This Is Not a "Hygiene" Disease

Scabies occurs at every socioeconomic level and in every age group. It is passed on through contact with an infested person; how often someone washes makes no difference, because the mite lives inside the skin, where soap cannot reach. In fact, in people who wash very often the burrows are less visible and the diagnosis may be delayed.

Shame directly undermines treatment: the patient does not tell the people close to them, they go untreated, and a few weeks later the infestation comes back in a cycle. Informing close contacts is not a confession — it is an essential part of treatment.

Diagnosis

The diagnosis is made by examination. Dermoscopy makes the burrow and the mite at its end visible, so the diagnosis can be confirmed during the visit.

This matters because scabies is often confused with other conditions: eczema, allergy, atopic dermatitis, insect bites. Patients are treated for months with antiallergic medication and cortisone creams. A cortisone cream temporarily reduces the itching and changes the appearance of the rash; while the picture becomes blurred, the infestation keeps spreading in the household. If an "allergy" does not go away, the itching gets worse at night and someone else at home is also itching, scabies must be ruled out.

Treatment

Medications

• Topical antiparasitic treatment. In Turkey, the standard treatment is permethrin 5%.

• Oral ivermectin — for widespread involvement, when topical treatment has failed, in communal living settings and when the medication cannot be applied properly.

The Rule Most Often Broken

A single application is not enough. The medications act on the mites but not on all the eggs, so the application is repeated after 7 days. Most cases described as "the treatment didn't work" are not resistance but a missed second application.

How the topical medication is applied:

• To the whole body from the neck down; in children under 2 and in older people, the head and face are included

• Without skipping skin folds, the area under the nails, between the fingers, the navel and the genital area

• Left on the skin for 8–12 hours, so applying it at night is more practical

• If the hands are washed during this time, the medication is applied to the hands again

Everyone Must Be Treated at the Same Time

People living in the same household and close contacts are treated at the same time, even if they have no itching or rash. Because the incubation period can last up to 6 weeks, a person without symptoms may well be infested. Treating people one after another is the most common reason the disease returns to the home.

Cleaning Belongings — No Need to Overdo It

Away from the human body, the mite survives for about 2–3 days. The following is enough:

• Washing bed linen, towels and clothes used in the last 3 days at a minimum of 60 °C, then drying them on a hot setting or ironing them

• Keeping items that cannot be washed in a tightly closed bag for 3 days

• Vacuuming mattresses and upholstered furniture

Disinfecting the whole home, wiping down walls, throwing belongings away or spraying insecticide is not necessary. Transmission through objects is of secondary importance; the time and money spent on these measures are taken away from where the problem is actually solved.

Itching After Treatment Is Normal

After successful treatment, itching may continue for another 2–4 weeks. This is a skin reaction to the dead mites and their waste, not a sign of failure. During this period, moisturizers and, on a doctor's advice, topical anti-inflammatory treatment can help.

A nodular form can also occur: firm, itchy nodules in the armpits, genital area and groin that persist for weeks or even months after no live mites remain. These do not require repeat antiparasitic treatment either.

Repeat treatment is needed only when new burrows and a new rash appear; continuing itch alone is not a reason.

A Separate Form: Crusted (Norwegian) Scabies

It develops in people with a weakened immune system, in older people and in bedridden patients. It presents with thick crusts, and the itching may be mild or absent altogether. This skin harbors thousands of mites, so it is extremely contagious and spreads even through brief contact. It requires combined treatment and close follow-up.

When to See a Doctor

• Itching that gets worse at night and disturbs sleep

• Someone else in the household is also itching

• An "allergy" or "eczema" that does not respond to treatment

• A rash between the fingers, on the wrists, around the waist or in the genital area

• A new rash appearing after treatment

Frequently Asked Questions

Why does scabies itch more at night?

The mite is more active at night, and the warmth under the covers increases this activity. Night-time itching that disturbs sleep is one of the most typical signs.

The itching hasn't stopped after treatment — is the disease still there?

Not necessarily. Itching can last 2–4 weeks because of a reaction to the dead mites. What signals failure is new burrows and a new rash, not the itching itself.

Is scabies caused only by poor hygiene?

No. It occurs in every social group and at every age. The mite lives inside the skin, and how often a person washes does not affect transmission.

How long should belongings be kept in a bag?

Three days is enough; away from the human body, the mite survives for about 2–3 days. Washing at 60 °C or higher, followed by hot drying or ironing, solves the problem directly.

Can I go to work or school during treatment?

Contagiousness drops markedly 24 hours after the first application, and a normal routine can usually be resumed. Prolonged close contact is best avoided until the course is complete, and everyone living in the same household is treated at the same time.

The information on this page is for general purposes only and does not replace a medical examination. The treatment plan is tailored to each person after the examination.