What should I do if my baby's hand is swollen all over after being bitten by a mosquito?

When a baby's hand swells after being bitten by a mosquito, parents can take the following measures to help relieve the symptoms: 1. Cold compress: Immediately apply a cold compress or cold towel to the baby's hand for 10–20 minutes each time. Repeat every 2–3 hours. Cold compresses can constrict capillaries, reduce blood flow to the affected area, and effectively alleviate swelling and pain. 2. Topical medications: Under a doctor's guidance, apply calamine lotion, compound acetic acid dexamethasone cream, or mometasone furoate cream to the baby's affected area. These medications have anti-inflammatory and antipruritic effects, which can help reduce inflammation and swelling. 3. Lifestyle adjustments: Maintain a light diet for the baby, avoiding spicy or irritating foods, and encourage consumption of more fresh fruits and vegetables. Additionally, keep the baby's hands clean and prevent excessive scratching to avoid secondary infection. If the baby's symptoms continue to worsen or other signs of discomfort appear, such as fever or expanding redness and swelling, seek medical attention promptly.