In a sense, yes. poison ivy (or, oak) rash will heal on its own. Poison ivy rash cannot be "cured", but you can treat the symptoms of a rash (redness, itching, swelling, blisters) with over-the-counter (OTC) treatments. However, for a rash lasting 10-14 days or longer with little to no improvement using OTC's, we recommend contacting your physician.