What causes a child to always have itchy buttocks, and what should be done?

Generally, persistent anal itching in children may be caused by inadequate hygiene, sweat irritation, diaper rash, perianal eczema, or pinworm infection. If any abnormalities occur, timely medical consultation is recommended. Specific causes are analyzed as follows:

1. Poor hygiene

Incomplete or improper cleaning—such as using harsh cleansers—can damage the skin barrier and lead to itching. Clean the buttocks with warm water and a mild cleanser, then gently pat dry with a soft towel, avoiding excessive rubbing or pressure on the skin.

2. Sweat irritation

Children are often physically active and sweat heavily, especially in summer or when overdressed. Sweat may not evaporate easily and can accumulate in skin folds around the buttocks. The salt and bacteria in sweat can irritate the skin, causing itchiness. Keep clothing dry, change underwear frequently, and use absorbent, breathable cotton underwear. After bathing, thoroughly dry the skin, particularly in the buttock folds, and apply talcum powder as needed.

3. Diaper rash

In infants and toddlers, the area covered by diapers—including the buttocks—may develop diaper rash due to friction from the diaper, and irritation from urine and feces. Symptoms include redness and itching, possibly accompanied by skin breakdown or oozing. It is recommended to frequently change to clean, dry diapers and keep the buttocks clean and dry.

4. Perianal eczema

Perianal eczema may result from bacterial infection or irritation from urine and feces. Eczema damages the skin's protective barrier, making it more susceptible to external irritants, leading to inflammation and itching. Symptoms may include redness, swelling, oozing, and dryness. Under medical guidance, topical treatments such as desonide cream, tacrolimus ointment, or hydrocortisone butyrate cream can help relieve symptoms and treat the condition.

5. Pinworm infection (Enterobiasis)

Pinworms parasitize the child's intestines. Female worms migrate to the anal area at night to lay eggs; proteins in the eggshells and worm secretions irritate the skin, causing intense itching. Symptoms may include worsening anal itching at night and disturbed sleep. Treatment with antiparasitic medications—such as levamisole hydrochloride granules, pyrantel pamoate tablets, or qunchong xiaoshi tablets—can be administered under a doctor’s advice.

Parents should monitor their child's health, schedule regular deworming, and guide children to develop good hygiene habits.