Hi, so I have dark discolorational spots under my breast a big quarter size dark spot on inner right thigh and I noticed tonight 10/8/13 before i got in the shower the my inner butt has big blotches of dark areas and iv never had it before!!! Also the spot on my inner tigh gets bigger when the ones under my brest show up.... The last time they showed up I took antibiotics that I had left over awhile before this condition. But it cleared up but i only took 3 doses out of like 14 but it did go away!

What could the spots be?

Should I just go to the doctors for it?