Bumps on the extremities are considered as follows: 1. Nodular itchy rash, which appears as dark brown nodules raised on the surface of the skin, and scratches can appear after excessive scratching. At this time, you can choose liquid nitrogen freezing, electro-ionic cauterization to get rid of nodules; by applying strong glucocorticoid ointment, keratolytic ointment for treatment, such as halomethasone ointment mixed with salicylic acid ointment, after application and then choose sterile cling film wrapping to promote the absorption of drugs in order to get rid of bumps. 2, papular urticaria, usually occurs in the hot summer, when there are more insects or mosquitoes, you can Apply Denide ointment, mixed with butyrophenic acid ointment for treatment.