Had a high fever for two days, and many small blisters appeared on the lips.

Fever lasting for two days has led to the appearance of multiple small blisters on the lips, likely caused by herpes virus infection. It is recommended to maintain proper local care and, if necessary, use medication as directed by a physician. Specific measures are as follows:

Elevated body temperature can reduce immunity. Prolonged high fever may cause skin warmth and redness, making the body susceptible to herpes virus infection, resulting in lip blisters. Initially, the blisters are small, but they gradually enlarge and increase in number as the condition progresses. This may also lead to local pain, swelling, redness, and itching. Once ruptured, fluid may exude from the blisters.

Blisters caused by the herpes virus are typically self-limiting and usually resolve spontaneously within about 7 days. During this period, avoid puncturing the blisters with needles or other unsterilized sharp objects to prevent bacterial infection. Maintain good local hygiene, avoid using cosmetics around the lips, and refrain from consuming spicy or irritating foods such as chili peppers and pepper. If symptoms are severe, topical application of erythromycin ointment or chlortetracycline ointment under medical guidance may help reduce inflammation and swelling.