The causes of red spots on the back need to be specifically analyzed according to different diseases: 1, folliculitis, mainly caused by Propionibacterium acnes infection, clinical treatment can choose to take oral roxithromycin capsules or azithromycin granules, topical clindamycin phosphate gel or fusidic acid cream for application, 2 times a day. 2, eczema, in addition to small red spots can also have flaky erythema, part of which can be fused into patches, accompanied by a certain Itching, mainly due to allergic factors. It may be caused by sun allergy in summer when the back is exposed to strong sunlight, or it may be caused by wearing chemical fiber clothing. For clinical treatment, you can take Epinastine hydrochloride capsules orally once a day, 2 capsules a time, or apply topical Denide ointment for treatment.