Does the child get a rash when it is hot? That's probably why.
1 heat urticaria
In high temperature or humid environment, the skin may appear red and swollen patches or papules, but also itchy. Avoid excessive sweating, wearing protective clothing or trying antihistamines.
2 allergic dermatitis
After contact with certain substances, the skin may be red and itchy, with blisters or scabs. Avoid contact with allergens and use some topical steroid ointment, which should be able to alleviate.
3 virus infection
Diseases such as rubella and measles can also cause rashes. If the child still has symptoms such as fever and cough, remember to rest more, eat lightly and drink plenty of water.
see a doctor
If the child has these symptoms, see a doctor at once. At the same time, keeping indoor ventilation, wearing loose clothes, avoiding allergens, washing hands frequently and replenishing water can also help them relieve discomfort.