Mixed heel plasters to protect against blisters.The handy mixed pack is ideal for the heel blisters or blisters at the bottom or side of your foot. While the Large Blister Plasters is ideal for the blisters on the back of the heel. Scholl Blister Plasters seal the blistered area providing protection against bacteria and dirt. They also keep shoes that might be fitting badly from causing repetitive rubbing and pressure. In particular, the delicate layer of skin on top of the blister will be protected until it is ready to drain by itself.