this is an overnight solution. Apply a warm compress for a few minutes. Before bed, apply toothpaste to the affected area. Yes toothpaste lol. It needs to be the plain white kind, not mint stripe if you can help it. Something in the toothpaste seemscto suck out any moisture, I.e the head. 9 times out of 10 it'll bring the core to the surface. If not- repeat until it does. If you can't burst it with a gentle squeeze, leave it.

good luck!