Hopefully by now you have either seen a doctor or your rash has resolved. Any number of things can cause a rash including allergies, viruses, reactions to medications, eczema, etc.
Here is an article about What to Do If You Have an Unexplained Rash that may help.
I hope this helps some.
Thank you for your question.
We hope you find this general health information helpful. Please note however, that this Q&A is meant to support not replace the professional medical advice you receive from your doctor. No information in the Answers above is intended to diagnose or treat any condition. The views expressed in the Answers above belong to the individuals who posted them and do not necessarily reflect the views of Remedy Health Media. Remedy Health Media does not review or edit content posted by our community members, but reserves the right to remove any material it deems inappropriate.