What causes large flat bumps on a child's body?

Generally, widespread flat bumps on a child's body may be related to factors such as sun exposure or temperature changes, insect bites, allergies, eczema, and acute urticaria. It is recommended that patients promptly visit a hospital and follow medical advice for treatment. Specific analyses are as follows:

1. Sun exposure or temperature changes: Prolonged sun exposure or intense cold or heat stimulation to the skin may trigger an allergic reaction, manifesting as widespread flat bumps. These are often accompanied by itching and may not present other specific symptoms. It is advised to avoid prolonged direct sunlight and pay attention to keeping the skin warm or cool as appropriate.

2. Insect bites: Skin inflammation caused by insect bites (such as mosquito bites) may lead to localized flat bumps, which may have a small red spot or blister at the center. Patients should use medications such as paeonol ointment, compound betamethasone and camphor cream, or camphor-menthol-salicylate cream under a doctor’s guidance to aid recovery.

3. Allergies: Allergic reactions to certain foods or contact substances in children may cause widespread bumps accompanied by itching, and sometimes gastrointestinal symptoms such as nausea, vomiting, or diarrhea. It is recommended to avoid consuming or contacting known allergens. Under medical guidance, medications such as cetirizine hydrochloride oral solution (use with caution in infants under six months), loratadine tablets, or promethazine hydrochloride tablets (use with caution in children under two years) may be used to support recovery.

4. Eczema: Prolonged sun exposure or improper diet may trigger eczema, leading to papules or vesicular papules on the skin surface, possibly accompanied by symptoms such as itching, redness, swelling, or oozing. Patients should use medications such as compound dexamethasone cream, zinc oxide ointment, or calamine lotion under a doctor’s guidance to promote healing.

5. Acute urticaria: Acute urticaria may result from genetic factors, allergies, infections, or other causes, presenting as large areas of bump-like rashes, often itchy, prone to recurrence, and in severe cases possibly accompanied by high fever, low blood pressure, or other systemic symptoms. It is recommended that patients use medications such as paeonol ointment, Binghuang Fule ointment, or doxepin hydrochloride cream under medical supervision to alleviate symptoms.

In daily life, maintaining a light diet and appropriately consuming vitamins and proteins—such as from broccoli and eggs—can help strengthen the immune system and promote overall health.