I have blisters on my hands that really itch but when i scrat h them they hurt what could they be?

Rash blisters: Your dermatologist should evaluate this rash promptly. This could be a form of eczema called dyshydrotic eczema. It could be a contact dermatitis to something in that you touched. There could be secondary bacterial infection or fungal infection. . Patch tests and cultures may be needed to get to the root cause. After the evaluation has begun your doctor can prescribe treatment for you.