The appearance of very small red dots on the body requires careful observation of the shape of the red dot area and one’s own sensation to determine how they are formed. If the small red dots are later developed at the end of the limbs with a slight bump with itching, it is considered to be allergic purpura caused by allergic factors. It is necessary to go to the local hospital to do blood routine and find elevated eosinophils to determine the disease. If the red dots do not fade significantly after pressure, you can choose to take oral loratadine tablets with fluticasone propionate cream for treatment. If the small red dots gradually fuse into flakes, touching with the hand and flattening with the skin, pressing does not fade, it should be a progressive pigmented purpura skin disease, you can choose to take oral compound rutin tablets with mometasone furoate cream for treatment. If the red dots are discolored by pressure and there is obvious itching, it is considered eczema-like dermatitis, and it is recommended to choose furnace glycolate lotion or zinc oxide cream. If the red dots appear on the trunk with fever and headache, consider scarlet fever caused by viral infection, you can choose to take oral ribavirin.