Do you have recommendations on how to pop a boil, to let it dry up? It's about dime-sized.

Carefully. The best time for opening a boil is when it has come to a pussy head. Warm compresses can help the boil to come to the surface, making it easier to drain. A pin or needle, cleaned well with rubbing alcohol or hydrogen peroxide, could be used to puncture the pustule from the side. It's not a good idea to squeeze or poke deep (vertically) into the boil.