If you constantly get blisters then put a plaster on the place where you get them to stop the rubbing, if that doesn't work you should buy some new ones, i use kooga boots and i really like them and they are excellent for scrums, rucks ect
use two pairs of socks one normal rugby sock and a thin under sock stops them from rubbing.
I always find wearing extra thick socks does the job, if its still giving you blisters maybe put a plaster on or you may have to consider buying a new pair :)
you could use a plaster or an under sock, however you could try to tighten your boots so there is less movement and friction between your foot and the boot. another method is to buy a better fitting boot as blisters usually mean the boot is too small or too big
use two pairs of socks one normal rugby sock and a thin under sock stops them from rubbing.
