C.J.
K.,
What about mole skin? This is found in the first aid aisle and is very sticky. You cut thin strips and place them around the sore in a square shape with a donut hole in the middle for the sore to air out.
The mole skin creates a raised area that protects the sore from being bumped and bruised until it heals. Many hikers use mole skin if they develop a blister from wet shoes and it makes a huge difference in the healing time of the blister.
Good luck!
-C..