Papular urticaria, also known as insect bite dermatitis, is an allergic skin disease caused by an allergic reaction to bites from mosquitoes, mites, worms, and even lice, fleas, ants, etc. It often occurs on exposed parts of the skin and in individuals with sensitive skin. Generally, papular urticaria can heal on its own. If left untreated, without further exposure to the irritant, and with a light diet and proper rest, it can subside within about a week. However, if there are many rashes, accompanied by erythema, vesicles, severe itching, or even secondary infections, and if the individual has a history of severe allergic reactions, it is advisable to seek timely medical attention at a standard hospital. Under the guidance of a doctor, use calamine lotion to relieve itching, or apply topical corticosteroid ointment and take antihistamines and traditional Chinese medicine orally. Additionally, at home, it is important to maintain cleanliness of clothes, mats, quilts, and plush items, and to sun them often to avoid further insect bites. (The use of medications should be under the guidance of a physician.)