What should I do if the blister from an insect bite keeps getting larger?

After a mosquito bite develops into a progressively enlarging blister, timely measures should be taken as follows: 1. **Keep the area clean**: Maintain cleanliness of the bite site and avoid scratching with hands to prevent infection. 2. **Cold compress**: Gently apply an ice pack or a cold damp towel to the affected area to help constrict capillaries and reduce swelling and itching. 3. **Medication**: - **Topical treatments**: If the blister has not ruptured, follow medical advice to apply boric acid solution as a wet compress. If the blister has already broken, take care to prevent infection and apply antibiotic ointments such as erythromycin ointment or fusidic acid cream. - **Oral medications**: If itching and swelling are severe, antihistamines such as cetirizine or loratadine may be taken orally under a doctor's guidance to alleviate the allergic reaction. 4. **Seek medical attention**: If the blister continues to enlarge or is accompanied by systemic symptoms such as fever and muscle pain, seek prompt medical care. A healthcare professional can provide appropriate treatment according to the condition, such as draining the blister fluid with a syringe.