first aid box.
It's great for sticking over a plaster, to stop it falling off, as even so-called waterproof ones do. I think it's also better for those cuts you get from rakers, because it lets them breathe - although it's not waterproof.
NB this is my personal opinion and should not be taken as any endorsement or recommendation of any treatment regime the next time you go to chin a fish and it shreds your knuckles.
Bankside first aid is a bit of a minefield in this politically-correct age, as if you believe some of the stuff you read there are so many things you can catch it's a miracle half of us even survive the winter.