I over squeezed a blackhead yesterday but half of it still didn't come out. now i'm left with a big fat bruise in the middle of my face. what do i do?

Hmmm....: In such a situation, one can hope there is not a developing infection under the skin, and that the "foreign body" reaction quiets down. A blackhead is the visible end of a comedone, a clump of dead skin cells stuck inside a pore. The stuff stuck behind it leaks into the skin, when squeezed or sometimes by itself, causing the "foreign body" reaction. Warm compresses may help. If needed, see the Dr.