Red spots on the back, most often seen in acute eczema or folliculitis, mainly due to allergic factors, bacterial infections and other reasons. If you are looking for the cause, if it is eczema, you need to isolate the allergens and avoid further contact, you can apply mometasone furoate cream on your back for anti-allergy treatment; if there is folliculitis, pus and other infections, you can use clindamycin phosphate gel, or fusidic acid cream for local skin anti-inflammatory treatment. Usually pay attention to diligent bathing to avoid bacterial infection in other parts of the body, drink more water, eat more fresh vegetables and fruits, avoid excessive spicy or greasy food, otherwise it is easy to stimulate the skin oil secretion phenomenon, change clothes regularly, wear breathable clothing.