Clear blisters filled with fluid appear after a mosquito bite, and they keep oozing fluid once ruptured.

Under normal circumstances, persistent fluid leakage from a clear blister caused by a mosquito bite may result from allergic reactions, excessive scratching, blister infection, the healing process after blister rupture, or papular urticaria. The specific details are as follows:

1. Allergic Reaction

Mosquito saliva contains certain anticoagulant substances and allergenic proteins. When a mosquito bites, some individuals may develop an allergic reaction to these substances, leading to localized skin congestion and edema that form blisters.

2. Excessive Scratching

After a mosquito bite, itching may cause repeated scratching of the skin, which can lead to blister rupture and subsequent continuous fluid discharge.

3. Blister Infection

If proper hygiene is not maintained after scratching or handling the blister, bacteria may enter and cause infection. An infection can lead to blister rupture and fluid leakage.

4. Healing Process After Blister Rupture

After a blister ruptures, the skin undergoes a natural healing process, during which a certain amount of fluid may exude. This is a normal part of healing and typically resolves spontaneously within a few days.

5. Papular Urticaria

Following insect bites, papular urticaria may develop, and scratching may lead to secondary infection. Treatment under a doctor's guidance may include medications such as cefaclor tablets or levofloxacin capsules.

In summary, if discomfort or symptoms persist, it is recommended to seek timely medical attention at a hospital to prevent adverse outcomes.