There are a lot of red dots on the arm, more and more, consider the following kinds of diseases: 1, herpes zoster: usually occurs in the upper limbs of the unilateral, in the clinical etiology, mainly due to the decline in the body’s immunity, infected with chickenpox herpes zoster virus and caused, so you need to antiviral treatment, you can take acyclovir tablets orally, the serious can be static Ribavirin injections or acyclovir injections, and external Penciclovir ointment The same time should also choose immunomodulatory drugs, thymus peptide enteric-coated capsules or splenic aminopeptide lyophilized powder orally, to improve the body’s immune ability. 2, eczema: mostly accompanied by itching sensation, in the clinical treatment of the oral administration of olopatadine hydrochloride tablets, and external glycerine lotion coating.