Theres something on my thigh and i dont know what is is, help?!

Yeah so i have this bump but it's black, its not black on the outside like a mole but it looks like it's on the inside of the bump!. it's on my thigh, and every time i try to squeeze it a little hard, it stings!. i did pop it or something one time and like this nasty whitish-Grey stuff came out, just when i thought it was fine, it came back!. I just wanted to ask before i see the doctor!. its been there for a little less than a year!. so it would be awesome if someone knew what it isWww@Answer-Health@Com

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