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Cutting off a blister:<a href="#ftn1" name="ftnref1">[1]</a>
It is forbidden to cut a blister from one’s body whether with ones hand [or teeth<a href="#ftn2" name="ftnref2">[2]</a>] whether with a vessel, whether for himself whether for others, whether it is [filled with] puss [blister] whether it is dry. If one does cut a puss [filled] blister with a vessel he is liable for the shearing prohibition according to those which hold one is liable for shearing even if he does not require that which is being sheared.
 style="text-align: justify"&gt;Summary
It is a Biblical prohibition according to some opinions to cut off a blister with a vessel, if the blister is filled with puss. It is Rabbinically forbidden to remove it with one’s hands [or teeth] even if it is dry.
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<a href="#ftnref1" name="ftn1">[1]</a> 340/3
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<a href="#ftnref2" name="ftn2">[2]</a> Ketzos Hashulchan 143 in name of Mishneh Berurah.
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Shulchan Aruch HaRav | Blisters

Cutting off a blister:[1] It is forbidden to cut a blister from one’s body whether with ones hand ] whether with a vessel, whether for himself whether for others, whether it is puss whether it is dry. If one does cut a puss blister with