There's a hard lump on my chin from a mosquito bite.

A hard lump on the chin caused by a mosquito bite is usually due to venom irritation, insect bite dermatitis, or local infection. In such cases, it is important to seek medical evaluation promptly and receive targeted treatment based on the underlying cause. Specific analyses are as follows:

1. Venom Irritation

After a mosquito bites the skin, it injects venom into the area, which irritates the skin surface and results in a red, hard bump, often accompanied by symptoms such as itching and swelling. It is important to clean the affected area promptly, perform proper disinfection, and maintain appropriate local care.

2. Insect Bite Dermatitis

This is an allergic reaction that occurs at the site of a mosquito bite, manifesting as localized redness and swelling, along with symptoms such as warmth and intense itching. It is generally recommended that patients apply medications such as calamine lotion or compound acetic acid dexamethasone cream locally under a doctor's guidance.

3. Local Infection

If skin damage from a mosquito bite is not properly cared for and is frequently scratched, it may lead to local infection. Due to inflammatory stimulation, the affected area may swell, exude fluid, or produce pus. Patients are advised to use topical medications such as mupirocin ointment or chlortetracycline hydrochloride ointment according to medical instructions.

Besides the common causes listed above, other factors such as prurigo nodularis may also be responsible. Patients should seek timely treatment to avoid delaying their recovery.