The possible causes of whiteheads on bumps are as follows: 1. This condition may be the appearance of eczema, because after the occurrence of eczema is generally manifested in the skin local, such as large papules, some papules may appear on top of the original basis of papules, and papules are the symptoms of whiteheads seen. Some people may also have varying degrees of itching, or the whiteheads may continue to develop and may form blisters, and if the blisters rupture, they may also have an oozing reaction; 2. It is also possible that the whiteheads on the bumps belong to papular urticaria, which may be caused by mite allergy or due to mosquito bites; 3. It may also be caused by other reasons, such as small pustules that occur due to pustular psoriasis, which also Small white heads on the bumps may appear; 4. It may also be a generalized, eruptive pustulosis.