There are many causes of red spots on the back, the common ones are as follows: 1, due to long-term insomnia, wearing clothes friction, etc., triggered by red spots on the skin, skin thickening, itching, white flakes as the main symptom consider dermatitis, you can use Dextran ointment, hydrocortisone butyrate ointment to rub the affected area, oral vitamin B2, B6, diclofibrate treatment; 2, due to a lot of sweating, humidity or Allergy to a substance, resulting in red red spots, papules on the back, itching, oozing, erosion, crusting as the main symptom of eczema, the use of glutamate lotion rubbing the affected area, choose cotton, loose clothing, dry with a dry towel in a timely manner after sweating; 3, due to infection and other reasons caused by pityriasis rosea, will also sweat red spots on the back, off white skin, itching symptoms, with hydrocortisone ointment mixed butyl Hydrocortisone ointment mixed with butylic acid cream to rub the affected area, oral treatment with compound glycyrrhetinic acid capsule.