The treatment of red dots on the arms varies according to the cause. 1, folliculitis: folliculitis is mainly caused by pathogenic bacterial infections, commonly including Staphylococcus aureus, spores of furfur, etc. If it is bacterial folliculitis caused by bacteria, you can choose to use topical antibiotic creams, commonly such as erythromycin ointment, fusidic acid cream, etc.; if it is fungal folliculitis caused by spores of furfur. The actual fact is that you can use topical antifungal creams, such as terbinafine hydrochloride cream, etc. 2, allergic purpura: allergic purpura may be related to infectious factors such as upper respiratory tract infection, allergic factors including pollen, dust mites, as well as drug factors, immune factors, etc. Usually you can choose to improve vascular permeability drugs, common ones such as rutin tablets, vitamin C, etc.