The child has developed numerous tiny red rashes on the skin.

1. Allergic reactions are triggered by certain substances in food, medications, or the environment, leading to skin rashes and itching. 2. Eczema is a common skin condition that causes redness, papules, and is accompanied by itching and oozing. 3. Measles is an acute respiratory infectious disease caused by the measles virus, characterized by red maculopapular rashes on the skin, and may be accompanied by symptoms such as coughing and sneezing. 4. Heat rash is usually associated with high temperature and humidity, presenting as dense small blisters or papules on the skin, accompanied by itching and a burning sensation. 5. Insect bite dermatitis is caused by insect bites, resulting in skin redness, swelling, and itching.