Can I cut my blister caused by eczema?

Generally, I do not advise you to cut out the blister, but you can prick the blister. Because sometimes the blister is so tense that when you press on it, it gets very painful, so what you can consider doing is take a sterile needle and just poke it to let the fluid come out, but do not remove the whole blister. Otherwise, the skin underneath is going to be very raw and painful, so the skin can act as a protection for the raw areas underneath it but you can consider pricking to release the fluid so the blister is not so tense and painful.