Red spots suddenly appear on the hands, accompanied by a stinging sensation.

Red spots appearing on the hands without any obvious cause, accompanied by a stinging sensation, are usually due to conditions such as eczema, folliculitis, or dyshidrotic eczema. Patients should seek medical guidance and use appropriate medications accordingly. Detailed analysis is as follows:

1. Eczema

Eczema is commonly associated with internal hormonal fluctuations and external environmental irritants. When eczema occurs on the hands, the skin may develop red papules or vesicular eruptions, accompanied by itching and stinging sensations. Patients should apply topical medications such as tacrolimus ointment or halometasone cream under medical supervision.

2. Folliculitis

Folliculitis occurs when hair follicles on the hand become infected with bacteria. Inflammation leads to localized red, firm bumps or papules, often accompanied by pain and mild itching. Under a doctor's guidance, patients may apply topical antibiotics such as erythromycin ointment or chlortetracycline hydrochloride ointment to relieve symptoms.

3. Dyshidrotic Eczema

This condition frequently develops during spring and summer and is associated with excessive sweating of the hands or frequent contact with water. It manifests as red papules or blisters on the skin, accompanied by itching and stinging. It is recommended to use topical treatments such as calamine lotion or compound acetic acid dexamethasone cream under medical supervision.

In addition to the above common causes, other possible factors include allergic dermatitis, contact dermatitis, and tinea manuum (hand fungus). Patients should maintain good hand hygiene and avoid scratching the affected areas once skin lesions appear.