large itchy blisters on fingers

a few days ago i developed an itchy blister on the side of my left ring finger that looked almost like a big pimple with a white head. This was the first one however i continued to get them all over my fingers and even on the top of my hand. The blisters are drippy and itch a lot. Some of the blisters eventually popped on their own and now they are like open sores that hurt and itch at the same time. If anyone knows what this could be and how to get rid of them that would be extremly helpful.