Bags at night may be associated with insect bite dermatitis, urticaria, contact dermatitis, scabies and so on. 1. insect bite dermatitis: such as mosquito bites at night can be caused by the bite site of the bag, if the bite is too serious can also appear all over the body, accompanied by obvious itching. 2. Urticaria: mostly related to the skin or mucous membrane subcutaneous capillary permeability increase and expansion, if the onset of the night can appear all over the body, itching symptoms. The surface of the skin may appear bright red or pale-white masses. 3. Contact dermatitis: such as sleeping at night after contact with new sheets and other exogenous substances, may cause allergies to contact dermatitis, manifested as the symptoms of the whole body bag. 4. Scabies: It is an infectious disease caused by scabies mites parasitizing on the skin surface, mostly seen in the thin and tender skin, folds, and itchy at night, and therefore, the symptom of bumps all over the body may appear at night. If you have long-term symptoms at night, it is recommended that you go to the hospital in time to find out the cause, and actively treat the cause to avoid delaying the condition.