A lot of small rashes on the arm may be physiological factors such as arm contact with allergens caused by the normal immune response, generally can be relieved on their own. There may also be keratosis pilaris or folliculitis and other pathologic factors, generally through drug treatment.
1. Physiological factors: due to arm contact with pollen, dust, etc. may cause the body to produce an immune response, causing skin allergies, skin rashes easily, away from the allergens can generally be relieved on their own.
2. Pathologic factors:
(1) perifollicular keratosis: due to genetic factors, metabolic disorders or vitamin A deficiency caused by the appearance of red pimples, so there will be a lot of small rashes on the arm, generally can be treated with medication, such as topical salicylic acid or retinoic acid cream and so on.
(2) Folliculitis: Due to the arm skin follicles being infected by Staphylococcus aureus, many small rashes will appear, accompanied by itching and pain and other symptoms. At this time, you can use topical mupirocin ointment, fusidic acid cream and other drugs.
A lot of small rashes on the arm may also be eczema, need to go to the hospital in time to find out the cause of the disease, under the diagnosis of the doctor for treatment, not to take their own medication, so as not to delay the condition.