Something on my thigh? looks like a zit but cant pop it?

its weird.. the first couple days it was just a red spot that hurt a little, but it was too small to pop, its been maybe 4 days and now its swollen, its a little darker in the middle of it but bright red all around it, and its really stiff/hard about an inch wide... its getting really painfull to even touch/ lift leg.. is this going to go away on its own? or should i just resist the pain and try to pop it? my insurance doesnt kick in untill a couple monthes from now so i really dont want to go to the doctors..