Understanding Scabies: Symptoms, Causes, and Treatment in the UK

Scabies is a common skin condition caused by a microscopic mite known as Sarcoptes scabiei. These mites burrow under the surface of the skin to lay their eggs, leading to an allergic reaction that causes intense itching and a noticeable rash. While the idea of a mite infestation can be distressing, scabies is a medical condition rather than a sign of poor hygiene.

In the UK, scabies outbreaks can occur in places where people live in close proximity, such as care homes, university halls of residence, or within family households. Because the mites can survive for a short period off the human body, the condition is highly contagious and requires prompt management to prevent it from spreading further through the community.

The most distinctive symptom of scabies is a severe itch that becomes particularly intense at night. This itching is caused by the body's immune system reacting to the mites, their eggs, and their waste. If you have never had scabies before, it can take up to eight weeks for the itching to start, though you can still spread the mites during this time. If you have had it previously, symptoms usually appear within a few days.

Key signs to look for include:

• Burrow marks: These are tiny, wavy, silver-grey or skin-coloured lines on the skin surface, often found between the fingers, on the wrists, or around the waist.
• A widespread rash: Small red spots or bumps that may look like tiny insect bites. In people with darker skin, these spots may appear brown or black.
• Sores: Formed by scratching the itchy areas, which can sometimes lead to secondary bacterial infections like impetigo.

In adults, the rash rarely affects the head or neck, but in infants and the elderly, the rash can appear on the face, scalp, and soles of the feet.

Scabies is almost always spread through direct, prolonged skin-to-skin contact with an infested person. Brief contact, such as a handshake or a quick hug, is unlikely to spread the mites. Instead, they are typically passed between sexual partners or members of the same household.

Less commonly, scabies can be spread through sharing clothes, towels, or bed linen. The mites cannot jump or fly; they crawl very slowly. However, they can survive away from human skin for approximately 24 to 36 hours. This is why treating the living environment alongside the person is a critical part of the recovery process in the UK.

Treatment for scabies focuses on eradicating the mite infestation. The NHS typically recommends two main types of insecticide creams or lotions:

• Permethrin 5% cream: This is the first-line treatment. It is applied to the entire body from the neck down (and the head in children or the elderly) and left on for 8 to 12 hours before washing off.
• Malathion lotion: Used if permethrin is not suitable or has been ineffective. This is left on for 24 hours.

Crucially, the treatment must be repeated exactly seven days after the first application. This ensures that any mites that hatched from eggs surviving the first treatment are also killed. It is also a requirement that all household members and sexual partners be treated at the same time, even if they show no symptoms, to stop the cycle of re-infestation.

It is important to understand that the itching often persists for two to four weeks even after the mites have been successfully killed. This is because the skin continues to react to the dead mites and debris left in the burrows. You can manage this discomfort with over-the-counter antihistamines or mild steroid creams (such as hydrocortisone) after the infestation treatment is complete.

To prevent re-infestation from the environment, you should:

• Wash all bed linen, towels, and clothing worn in the three days prior to treatment at 60°C or higher.
• Items that cannot be washed can be sealed in a plastic bag for at least 72 hours, as the mites will die without human contact.
• Vacuum carpets and upholstered furniture in the home.

If you suspect you have scabies, it is important to seek medical advice for an accurate diagnosis, as the rash can sometimes be confused with eczema or other skin conditions. A GP can provide the necessary prescriptions and guide you on the correct application of treatments.

You should consult a GP if:

• The itching has not significantly improved four weeks after completing the two-stage treatment.
• The skin looks bright red, hot, or is leaking fluid, which may indicate a bacterial infection.
• You are pregnant or breastfeeding and need advice on which treatments are safe for you.
• You have a weakened immune system, which can sometimes lead to a more severe form called 'crusted scabies'.

An online GP at OnlineDoctor24 can review photographs of your rash and provide a private prescription for effective treatment, saving you the need to wait for an in-person appointment while dealing with a contagious condition.