Why do i get small wather blisters on palm of my hands?

Could be: Blisters on the palm could be from contact dermatitis or eczema and less likely from infections. Protecting the hands from contact with chemicals and use of topical moderate to high potency steroids may be helpful.

Pompholyx: Small blisters on the palms and perhaps soles, especially when it is warm, tending to break leaving cracks that can be itchy, suggests dyshidrotic eczema / pompholyx. Read about it and see if it's a match. There are a variety of treatments depending on severity.

Dyshidrosiform ecz.: This may be a condition called dyshidrosiform eczema (or dermatitis), the primary cause of which is unknown. Aggravating factors may include irritants or allergens.