Boil, pimple, spider-bite, or what?!

My boyfriend has a "pimple" on his hip!. Kind of more on his outer thigh i guess!. It is huge and he tried to pop it but it just hurts really bad!. He popped it once and it bled but no pus came out!. A few days later he was in a warm shower and it popped on it own but more blood and very little pus and its still there!. We've been cleaning it and putting warm compresses on it!. The redness seems to be going away but it still hasn't went away!. And it hurts him to much to try to pop it!. What should we do or what do you think it is!?Www@Answer-Health@Com

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