I don't think it's likely to be herpes, but ..

you should get tested so you know definitively. Testing in the US varies in price. The test you will want is an HSV 1&2 IgG test like the Focus Labs HerpeSelect that is available almost everywhere. One way to get it in the US without having to see a doctor is to use
http://healthcheckusa.com
Don't be too surprised if you show up as having HSV1 as a large majority of the adult population will test positive for it as a result of having it orally, as in cold sores. Many of the people that have it don't know as they don't have any symptoms.

Let me know if I can help further, Arielle.