Itchy bumps on the skin at night may be caused by hives, eczema, mosquito bites, contact dermatitis and so on. 1. hives: hives is a kind of allergic skin inflammation, usually easier to appear in the change of season, after the disease occurs, the patient is very easy to appear in the night time bumps on the body itchy problem, and itching feeling is more intense. If you scratch at this time, then the local rash will grow a lot, thus making the discomfort more intense. 2. Eczema: eczema is a very easy recurrence of skin diseases, this disease is also very easy to flare up in the night time, and make the skin lesions of the triggers is very complex, if not get the right control and improvement. 3. Mosquito bites: If the problem of itchy bumps on the body at night occurs in the summer, it is likely to be caused by mosquito bites. 4. Contact dermatitis: itchy body at night, the first consideration of the skin contact with certain allergic substances caused by skin allergies, such as some patients in contact with mites, unclean bedding and flowers and plants will occur allergic dermatitis. This situation can be improved and relieved by staying away from allergenic substances. If the skin is itchy at night, it is recommended that the patient consult a doctor to clarify the cause of the disease and give targeted treatment.