Small, watery blisters on fingers. Usually same finger. What can I do to prevent & treat?

Dyshidrotic Eczema. Dyshidrotic eczema causes small fluid-filled blisters called vesicles appear on the fingers, hands, and feet. They are most common along the edges of the fingers, toes, palms, and soles. These blisters can cause intense itching and scaly patches of skin that flake constantly or become red, cracked, and painful. Treatment is usually with strong topical cortisone creams like clobetasol.
Eczema. If these are itchy is probably dyshidrotic eczema. Topical steroids will help but will need intermittent use. Adding fish oil 1000 mg twice daily, finding out if you have any food allergies which tend to drive eczema flares as does stress will help prevent. Look at a4m.Com website "doc locator" for a local functional medicine doc who can help evaluate for allergies and guide natural treatment.