What causes red rashes on hands and feet accompanied by pain upon movement after a high fever, and what should be done about it?

High fever refers to hyperthermia. In general, the appearance of red rashes on the hands and feet following a high fever, accompanied by pain upon movement, may be caused by drug allergy, urticaria, telangiectasia, purpura, or scarlet fever, among other conditions, requiring targeted treatment. It is recommended to seek medical attention promptly for diagnosis and treatment. Specific analyses are as follows:

1. Drug Allergy

Drug allergic reactions can trigger systemic inflammatory responses, including skin symptoms. An allergic reaction occurs when the immune system becomes overly sensitive to a particular medication, releasing excessive substances such as histamine, leading to the development of red rashes. Besides rashes, other systemic allergic symptoms may occur, such as fever, chills, headache, nausea, and vomiting. The suspected medication should be discontinued immediately, and symptomatic relief should be sought under medical guidance using medications such as promethazine hydrochloride tablets, ketotifen fumarate capsules, or cetirizine hydrochloride tablets.

2. Urticaria

Urticaria is an allergic skin disorder commonly triggered by foods, medications, insect bites, or infections. Affected skin areas develop red wheals with clearly defined borders; sometimes the center may appear depressed. Itching is common, and lesions may appear singly or in clusters. It is recommended to follow medical advice and use topical treatments such as compound beclomethasone and camphor cream, Efu Kang lotion, or calamine lotion to alleviate symptoms.

3. Telangiectasia

Telangiectasia may result from abnormal vascular regulation, causing blood vessel dilation and blood pooling within capillaries. This condition leads to red rashes on the hands and feet, along with sensations of burning and pain, possibly accompanied by fever. The rashes may appear in a net-like pattern on the skin. Medical treatment options include laser therapy targeting the affected dilated capillaries to destroy the abnormal vessels.

4. Purpura

Purpura is a hemorrhagic skin disorder typically caused by rupture of capillaries, allowing blood to leak into surrounding tissues. It causes red rashes on the hands and feet, along with small purple-red spots or patches on the skin, often accompanied by petechiae (small bleeding points), and patients may even experience pain. Treatment under medical supervision may include vitamin C tablets, danazol capsules, or methylprednisolone tablets.

5. Scarlet Fever

Scarlet fever is an acute infectious disease caused by infection with group A beta-hemolytic streptococcus. One of its typical symptoms is severe sore throat, along with a characteristic erythematous rash. Skin symptoms usually appear one to two days after onset, presenting as red spots or patches commonly found on the trunk, armpits, elbows, groin, and ankles. Treatment based on medical advice may include procaine penicillin for injection, cefixime capsules, or erythromycin tablets.

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