On my skin, at first it was a red bumb, in the past few days it has become a bigger, more painful bump...?

GET TO THE ER NOW!!!!!!! What you just described sounds like a bite from a brown recluse spider, the deadliest there is. The skin is black because it's dying. GET HELP!!!!!!

Sounds like a spider bite I think it's the brown recluse and they are poisonuis. I would get into see someone ASAP but that's just me. I belive it can spread and that it may be killing your skin where it bite you. I'm not for sure on all this but I would at least look it up online and find out and see a doc like NOW. Ok I just looked at some pics of bites online pre warning when you go look they can be really gross if you they are left for to many days.

well i know about this. this bump is no ordinary bump its a pimple and a big one too u should try not to pop it because it can make it worse by leaving a bad effec behind like a permenant big scar and here are somethings to make it smaller and maybe vanish it sylcic acid this particular acid chemical dries up bumps and pimples try using it but follow what your doctor consults you.later have a nice day try to ignore it eh

Wow, no I don't know, but I sure would not wait until Wednesday. . . have you considered an out-patient clinic??

Or just another doctor.