Finger blisters?

Judging from your description, you should have herpes zoster, also called sweating disorder rash, which is a reaction similar to skin eczema. Herpes zoster has no obvious sweat gland invasion and sweat retention, and is more common at the junction of black and white skin of hands and feet (palm and back of hand).

In the early stage of blister formation, the sweat gland duct is not affected, either on one side of the blister or through the epidermal membrane between two adjacent blisters. Only after the epidermal septum is necrotic does the sweat gland duct break into the blister. Therefore, sweat retention can be secondary to blisters, aggravating the symptoms of herpes zoster. On the contrary, reducing sweating on palms and soles is beneficial to the relief of symptoms.

Modern people are under great work pressure, especially some white-collar workers. Due to the limited working environment, hands and feet are prone to sweating, fungal infections and allergic reactions. Herpes zoster can occur. Summer is hotter, so summer is more common.

Because it occurs in places where sweat glands are particularly developed, such as hands and feet, blisters are the main manifestations, so it was once thought to be related to sweat glands, so it was named sweat herpes.