Is the water that collects under the skin due to severe friction, resembling burn blisters, ritually impure or not?

The fluid accumulated in burn blisters (serous fluid) is a liquid that arises from burns or severe friction, and it works to protect the damaged skin. It is most likely that this fluid is pure unless its smell or color has changed. Jurists have differed regarding its impurity, but the adopted view among the Shafi'is is its purity. The disagreement among the Hanafis is concerning whether it invalidates ablution.