The child has a dense small red rash, which may be related to allergies, eczema, infections, etc. It is necessary to seek medical attention in a timely manner, and the doctor will determine what causes it, and then take the appropriate drug treatment. 1, allergies: the child has a dense small red rash, which may be caused by allergies to food, pollen, dust, drugs, etc., which should go to the hospital to identify allergens and away from allergens, under the guidance of the doctor Use antihistamines, such as loratadine, chlorpheniramine maleate tablets, etc. The main manifestation of eczema is a skin inflammation caused by internal and external factors, mostly corn-like papules, erythema, papules and other lesions, when the child has a dense small red rash, consider the possibility of eczema-related. You can first remove the triggering factors, local topical saline, potassium permanganate solution, furnace glycolate lotion, etc. for rinsing, wet compresses, or follow medical advice to apply glucocorticoid cream, tar preparations and other drugs for treatment, but also follow medical advice to apply antihistamines to stop itching, but not recommended for long-term application; 3, infection: human body due to bacterial, viral infections caused by rash diseases, such as measles, early childhood emergency rash, chicken pox, scarlet fever, etc. Scarlet fever, when the child’s skin will appear dense red rash, usually take isolation measures, and diligently change the child’s clothes to keep the skin clean, and then follow medical advice to apply antibiotics such as penicillin, azithromycin, or antiviral drugs such as acyclovir for symptomatic treatment. For children with fever, oral antipyretic and analgesic drugs such as ibuprofen and acetaminophen can be used. In addition, some herbs can be used to relieve discomfort and assist in treatment. There are many reasons for a child to have a dense rash on the skin, so it is recommended to go to the hospital immediately for a relevant examination to identify the cause and treat the symptoms.