What causes small red spots on the arms, and what should I do?

Generally, red spots on the arms may be caused by mosquito bites, trauma, urticaria, viral infections, purpura, or other reasons. If the above symptoms occur, it is recommended to seek medical attention promptly for appropriate treatment. The specific analysis is as follows:

1. Mosquito Bites: After a mosquito bite, components in the mosquito's saliva may trigger an allergic reaction in the body, leading to localized red spots accompanied by itching. It is recommended to apply a cold compress with a cool towel to alleviate local redness, swelling, and itching.

2. Trauma: After the arm experiences external impact or pressure, subcutaneous bleeding or soft tissue damage may occur, forming red spots. Trauma may also cause localized swelling. Initially, cold compresses are recommended to reduce bleeding and swelling, while warm compresses can be used later to promote the absorption of bruising.

3. Urticaria: Urticaria is typically an allergic reaction-induced skin condition. Factors such as food, cosmetics, clothing, and environmental triggers can cause red spots. Urticaria may be accompanied by localized itching. For severe cases, it is recommended to follow medical advice and use medications such as calamine lotion, desonide cream, or cetirizine hydrochloride tablets to help alleviate skin itching and swelling.

4. Viral Infections: Certain viral infections, such as molluscum contagiosum or herpes zoster, can cause skin inflammation and red spots. Patients may also experience itching, fever, and other symptoms. If the above symptoms are caused by a viral infection, it is recommended to follow medical advice and use medications such as valacyclovir tablets, acyclovir tablets, or acetaminophen to inhibit viral replication and alleviate discomfort.

5. Purpura: Purpura is usually a skin condition caused by abnormal blood vessel walls or reduced platelet count, presenting as purplish-red papules or red spots on the skin. Patients may also experience itching but typically no pain. It is recommended to follow medical advice and use medications such as methylprednisolone tablets, prednisone acetate tablets, or loratadine tablets for symptomatic treatment, which can suppress inflammatory reactions and reduce vascular permeability.

Red spots appearing on the arms can be caused by various factors, and the appropriate treatment plan should be determined based on the specific underlying cause. In daily life, patients are advised to maintain a healthy lifestyle and keep the affected area clean to help control the condition.