Itchy bumps at night, daytime is fine, including scabies, mosquito bites, contact dermatitis and other causes. 1. Scabies: If scabies, due to scabies is more active at night, at this time can appear at night the symptoms of itching all over the body. 2. Mosquito bites: when sleeping at night, when mosquitoes will come out to feed, easy to bite the skin, there will also be itchy skin pimples phenomenon. 3. Contact dermatitis: when the skin comes into contact with irritating or sensitizing substances at night, skin damage can also occur, resulting in itchy skin bumps. There may be other reasons for the above situation, it is recommended to go to the hospital, to clarify the cause of the disease, symptomatic treatment.