Is it herpes or just an infection?

Patient: I recently got the IUD inserted.. a few days later I felt very itchy in my vaginal area at night. The next morning I had really dry skin and a bump with an open sore that looks like a paper cut. It has been a few days and while the itching has gone away the sore is still there. Could this be an allergic reaction? I also have sensitive skin and eczema but it’s normally on my arms and hands. I’m worried that i may have a more serious problem. What do you think it could be?

Symptoms: Itching, red, open sore