There are red spots at the webbing between the thumbs of both hands.

Red spots appearing at the webbing between the two thumbs are usually caused by conditions such as cherry angiomas, eczema, or allergic dermatitis. Treatment should be determined based on the specific condition. Detailed analysis is as follows:

1. Cherry Angioma

This condition commonly occurs in middle-aged and elderly individuals and is associated with factors such as ultraviolet radiation exposure and skin aging. It presents as small, raised red spots on the skin surface and typically does not cause discomfort. In most cases, no treatment is required.

2. Eczema

Eczema is often related to external environmental irritants or allergies. When eczema develops on the hands, localized red papules or vesicular papules may appear, accompanied by symptoms such as itching, oozing, and stinging pain. Patients are advised to use medications such as halometasone cream or desonide cream under a doctor's guidance to alleviate symptoms.

3. Allergic Dermatitis

If the hands accidentally come into contact with allergenic substances, a localized allergic reaction may occur, resulting in red rashes along with symptoms like itching, swelling, and warmth. In such cases, patients should follow medical advice and take antiallergic medications such as levocetirizine hydrochloride tablets or chlorpheniramine maleate tablets for treatment.

In addition to the common causes mentioned above, other possible factors include contact dermatitis, insect bite dermatitis, and herpes zoster. Patients should seek timely medical attention to avoid delays in diagnosis and treatment.