Wreckers got it – being an ex walky type – well, ex walky/jumpy type…….
After a particularly wet tab across various Scottish hills, I had a blister that formed covering the entire heel of one foot one. Medic said pop it, trim it and pour vodka over it – ‘you’ll be reet’ were his exact words. So I popped it, cut it off and screamed like a girl as the vela did its drying up stingy thing.
What made us, almost to a man, vomit was that as I threw away the trimmed 2″ pad of dead skin, a seagull descended and gobbled it down. Boak!
Sorry, OP just trim it an cover in alcohol to dry it off. It’ll sting like ****, but will heal reasonably quickly.