Hands and arms long red spots, two days after the elimination of the situation, may be and insect bite dermatitis, folliculitis, etc., can be relieved through the use of topical glucocorticoid drugs, anti-infective drugs and other ways. 1. Insect bite dermatitis: this is an allergic reaction to insect bites, manifested by bites and itchy lesions, localized red spots, blisters and other symptoms, can be used with the doctor external hydrocortisone butyrate and other glucocorticosteroid drugs coated, can play a role in stopping the itching. At the same time, do a good job of environmental deworming treatment. 2. Folliculitis: Bacterial infection in the hair follicle area can cause folliculitis, which is commonly caused by Staphylococcus aureus infection, and the rash is easy to repeat. You can follow the doctor’s instructions through the external use of fusidic acid cream, mupirocin ointment and other anti-infective drug treatment. Red dots on the hands and arms two days to eliminate and long there may be other reasons, if necessary, need to cooperate with the doctor to do further examination, and give targeted treatment and treatment.