There are a lot of red raised dots on the arm may be related to folliculitis, acute eczema and other factors, the patient needs to be based on the specific causes of physical therapy, drug therapy and other methods of treatment. 1. Folliculitis: bacterial infection of the entire hair follicle occurs purulent inflammation, initially for the red papules, the number of more, isolated scattered, self-conscious mild pain. Antibiotics can be used as appropriate, and local 1% neomycin ointment, mupirocin ointment, fusidic acid cream or 2% iodine tincture can be applied externally. 2. Acute eczema: patients with acute eczema, in addition to the appearance of a lot of red raised dots on the arm, will be accompanied by varying degrees of burning sensation and itching. For this situation, patients can usually take oral antihistamine drugs for treatment, such as cetirizine, ebastine and so on. There are other reasons for the appearance of many red raised dots on the arm (such as hives, insect bite dermatitis), it is recommended that patients go to the hospital in time to find out the cause of the disease, standardized treatment, so as not to delay the condition.