Suddenly developed many red spots on hands and arms

Sudden appearance of numerous red spots on the hands and arms is usually caused by conditions such as eczema, folliculitis, or allergic dermatitis. Treatment should be selected based on the specific condition. Detailed analysis is as follows:

1. Eczema

This is commonly associated with recent hot environments or exposure to allergens. Patients may develop red rashes or vesicular papules on the skin surface, accompanied by symptoms such as oozing, stinging pain, and erosion. In such cases, topical medications like halometasone cream or tacrolimus ointment should be used under medical guidance to relieve symptoms.

2. Folliculitis

When hair follicles on the hands or arms become infected with bacteria, localized congestion occurs, leading to red rashes accompanied by tenderness and pain upon touch. Patients should follow medical advice to apply topical treatments such as fusidic acid cream or erythromycin ointment.

3. Allergic Dermatitis

If a patient has sensitive skin and recently came into contact with an allergen, a local allergic reaction may occur, manifesting as erythema or red rashes on the skin surface, along with itching and warmth. In such cases, patients should take antihistamines such as levocetirizine hydrochloride tablets or loratadine tablets as prescribed to alleviate symptoms.

In addition to the common causes mentioned above, other factors such as contact dermatitis, herpes zoster, or papular urticaria may also be responsible. Patients should seek timely medical attention to avoid delays in diagnosis and treatment.