How does urticaria rise when hot do

Urticaria is a skin disease characterized by wheals and severe itching caused by a temporary edema of the skin caused by various causes. The causes of urticaria are particularly complex, including food, drugs, mental factors, immune factors, and physical factors. If urticaria develops on heat, it is caused by physical factors. The rash of urticaria is caused by temporary edema of the dermis caused by vascular dilation caused by elevated temperature. Urticaria can be treated orally, preferably with second-generation antihistamines, such as cetirizine, loratadine, ebastine, etc. It can also be treated externally with topical medications, such as calamine lotion and topical corticosteroid ointment.