Ben,
Have you tried using an anti-inflammatory topical creams? Assuming the rash has not gotten worse (spread, exudation, etc) and that you have not developed any new symptoms, I would suspect that an office visit would most likely result in a prescription for a medium strength (~10%) hydrocortisone cream. I believe that the over-the-counter brands are about 1%. It may be more prudent to try that first for a few days.
However, if you have good coverage/low copay...there would be no harm in seeing your primary care physician. If you do not have coverage, see if there are any walk-in clinics in your area. The med students here run a free walk-in clinic twice a week in Urbana.