There are many rashes on my body when the weather is hot.

If the patient suddenly has fever and rash in a short time, accompanied by obvious itching symptoms and normal body temperature, it can be considered as allergic urticaria.

It is suggested that patients can take oral antiallergic drugs or use hormone drugs for treatment first, and stay away from suspected allergens.

If the patient has repeated fever symptoms, the rash will gradually evolve into herpes, so it is more likely to consider viral infectious diseases first. Chickenpox, hand-foot-mouth disease, acute rash of infants and other common diseases.

Generally, Chinese patent medicines for clearing away heat and toxic materials should be treated with antiviral drugs and symptomatic drugs. If necessary, you need to go to a regular hospital for dermatological or pediatric examination and diagnosis.

Most allergic urticaria is caused by allergic mechanism. Allergens in food (mostly heterologous proteins) stimulate the human body, causing the human body to produce specific antibody IgE (immunoglobulin E), which is attached to mast cells or basophils in the body. When eating this food again, IgE antibody will combine with allergens in the food, thus making mast cells and basophils release histamine. Histamine also acts on blood vessels, dilating blood vessels and increasing permeability, so a large amount of protein and liquid seep into skin tissue, resulting in urticaria. This is a type I allergic reaction.

Allergic urticaria occurs in expect the unexpected, and the skin can itch abnormally in an instant. With itching and scratching, red and light rashes of different sizes and shapes will soon appear. Some of them are ring-shaped or can be combined into large blocks, which will quickly fade away in about 10 minutes to several hours without leaving any trace. The location of the rash is uncertain. If you scratch your child's normal skin with a needle, a red papule consistent with the scratch may appear.

Most children have no other discomfort except itchy skin; A few children with visceral involvement have fever, headache, breath holding, nausea, vomiting, diarrhea, abdominal pain and other discomfort; In severe cases, there are shock manifestations such as pallor, dyspnea and decreased blood pressure.