I guess disinfecting a piece of cotton is impossible.
I don't know about the string thing, never heard that before, but I would definitely pop it with a needle but leave the skin over the top mainly intact, so in effect you have an empty blister but the sore, open area is covered with skin.
Well, I found that popping it in a small point, then leaving it for a few days till the top layer of skin dies, then cut it off like a flapper, by which point the skin underneath has repaired itself to an acceptable level.
Limestone is wank
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