How To Get Rid Of Dark Mark On Forehead?

hello i had a bump on my forehead an it turned into a black head i think anyhow i put some scar/mark gel on my head next day the bump was so swollen that it was crazy 1week later i messed with it an pushed on it an it was so nasty it bust an made 3 hole in that 1 bump now its a dark mark that won't go away its been almost 2months what should i do i need this mark to leave my face