Itchy bumps on the body at night, may be hives, eczema, scabies caused by. 1. Hives: itchy bumps on the body at night may be hives, hives, hives, there will be red spots and wind. It can usually subside on its own without leaving traces, but in other places, new rashes will form. In severe cases, they will fuse into fragments and take on an orange peel-like appearance, accompanied by severe itching. 2. Eczema: Eczema is an allergic reaction of unknown cause. Eczema itches when exposed to heat, and because the temperature of the quilt is higher at night, it will appear on the body at night itchy bumps when scratched. This may also be because the sympathetic nerves are more excited at night, so the pruritus will be more serious. 3. Scabies: scabies night activity increases, scabies itching symptoms are usually more serious at night, itching during the day to reduce or disappear. So it will appear on the body at night itching a scratch up bumps. Therefore, once the symptoms of night itching and bumps on the body, you should go to the hospital as soon as possible for treatment and allergen testing.