Blisters on hands and feet after fever

　　"Water blisters" refer to vesicles. In general, the appearance of blisters on the hands and feet after fever may be caused by drug allergy, eczema, contact dermatitis, dyshidrotic eczema (pompholyx), or herpes zoster, among other reasons, and targeted treatment is required. It is recommended to seek medical attention promptly for diagnosis and treatment. Specific analyses are as follows:

　　1. Drug Allergy

　　Drug allergy is a common allergic reaction. When a drug enters the skin and interacts with ultraviolet light, it triggers an immune response, leading to blister formation. This may also cause skin itching and red rashes. The suspected medication should be discontinued immediately, and antiallergic drugs such as promethazine hydrochloride tablets, ketotifen fumarate capsules, or cetirizine hydrochloride tablets may be used under a doctor’s guidance to alleviate symptoms.

　　2. Eczema

　　Eczema is a skin condition that may result from abnormal immune responses or allergies. It damages the skin barrier, causing moisture loss and making the skin susceptible to bacterial invasion, which can lead to blister formation. Symptoms may include fever, intense itching, erythema (red patches), dry skin, and scaling. Blisters may appear during acute flare-ups of eczema. Treatment may include topical medications such as anti-dampness and anti-itch ointment, dexamethasone acetate cream, or mometasone furoate cream, used under medical supervision.

　　3. Contact Dermatitis

　　Contact dermatitis is inflammation caused by skin exposure to allergens or irritants, such as detergents, cosmetics, or metals. Symptoms may include redness, itching, a burning sensation, and blisters. These symptoms typically develop rapidly after contact with the allergen. Treatments may include calamine lotion, mupirocin ointment, or compound dexamethasone cream, as recommended by a physician.

　　4. Dyshidrotic Eczema (Pompholyx)

　　Dyshidrotic eczema occurs due to blockage or occlusion of sweat gland ducts, commonly in hot and humid environments. Blocked sweat glands cause sweat to accumulate beneath the skin, forming blisters, often accompanied by burning and itching. Topical treatments such as hydrocortisone cream, desonide cream, or tacrolimus ointment may be used under medical guidance.

　　5. Herpes Zoster

　　Herpes zoster is caused by reactivation of the varicella-zoster virus, which lies dormant in nerve cells. When the immune system weakens, the virus becomes active again, leading to blisters appearing along specific nerve pathways. Symptoms include fever, itching, and pain, followed by red skin patches and then blisters. Management may include antiviral medications such as acyclovir cream, recombinant human interferon α2b injection, or valacyclovir hydrochloride granules, as prescribed by a doctor.

　　In daily life, maintaining a light diet, drinking plenty of water, and ensuring adequate sleep can support overall health.