Small red dots all over the body after fever is usually a symptom of viral rash, scarlet fever or drug dermatitis, you need to go to the hospital in time, under the guidance of the doctor to use medication. 1. Viral rash is a general term, including rubella, infantile emergency rash and other rash diseases. It is more contagious, mostly seen in children, often in kindergartens, primary and secondary schools and other places of aggregated incidence. Viral rashes can usually recover on their own, and can be treated with heat-clearing and detoxifying Chinese medicines such as Pu Di Lan Oral Liquid and Blue Scutellaria Oral Liquid to speed up the receding of the rash. 2. Scarlet fever is caused by bacterial infection, and the rash usually starts on the second day after the onset of fever, starting from behind the ear and spreading downward gradually. Scarlet fever treatment is based on antibacterial, intravenous drip penicillin treatment, penicillin allergy can be intravenous azithromycin, clindamycin and other drugs. 3. Drug dermatitis is usually caused by taking certain drugs after fever, part of the antibiotics, purging and detoxification of traditional Chinese medicine may cause allergic reactions. The manifestation of the body after taking the drug appeared stool erythema and red spots, accompanied by intense itching. Drug dermatitis can be treated with antihistamines such as oral loratadine tablets and cetirizine tablets. In severe cases, intravenous glucocorticosteroids such as dexamethasone and methylprednisolone are needed.