Hi Dianna,
Based on the information that you have provided in your question I am going to suggest that you probably have a inflamed cyst or carbuncle.
Each of these would result in a hard sore spot. The soreness would be the result of infection. Depending on how large the one you have is and the amount of infection it contains can also account for the swelling.
I would suggest that you get in to see your doctor as soon as possible. In addition to prescribing antibiotics for the infection, ther are times that your doctor will lance the cyst or carbuncle to clean it out and to prevent it from forming again.
These are not the product of an STD and are common in many people. The area that they appear in is also wide and varied. I have seen them on the torso, legs, and armpits to mention a few!
If this information has been helpful to you then please do ACCEPT. Let me know if I can help you further.
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Terri L. Romaker
