Children with red rashes on the face may be caused by eczema, mosquito bites, contact dermatitis and other reasons. 1. Eczema: mostly caused by allergies, hot living environment, etc. Clinically, acute lesions are dominated by herpes papules, which are found on the face, ears, hands, feet, forearms, calves and other exposed parts of the body. 2. Mosquito bites: especially common in summer. When children’s faces are bitten by mosquitoes, their skin is relatively fragile, which may lead to a long red rash on the face. 3. Contact dermatitis: mostly seen in allergic children. When children come into contact with pollen, animal hair, certain foods, medicines and other allergens, it can cause an allergic reaction to the skin, which can lead to the symptoms of a red rash on the face, accompanied by obvious itching. 4. Other diseases: such as infantile emergency rash, chicken pox, scarlet fever and other infectious diseases, in addition to causing a red rash on the face, may also lead to the trunk, limbs and other places also appear red rash. The causes of red rash on the face of children are many, parents should not blindly use medication, should avoid children scratching the itchy place, so as not to aggravate the symptoms. It is recommended to go to the hospital in a timely manner, after clarifying the cause of the disease, under the guidance of the doctor for targeted treatment.