A lot of small red bumps on the back may be eczema. If it is eczema, you can usually use Denide cream or Pirenzone cream for topical application, and you can take second-generation antihistamines orally, usually Ebastine, Loratadine, Levocetirizine Hydrochloride, etc., all of which can be taken orally one a day. However, if the bumps are not eczema, but acne vulgaris or acne vulgaris, you need to take oral danshenone capsules and topical fusidic acid cream, or topical adapalene gel or clindamycin gel. This can be done while paying attention to local cleanliness and hygiene.