A poison oak, ivy, or sumac rash is not contagious. It is however, extremely uncomfortable for the afflicted person. Symptoms include redness, itching, swelling, and blisters, according to Mayo Clinic. Rashes caused by poison ivy, oak, or sumac typically heal on their own within a few weeks. But why would you patiently suffer through the pain? You can make the rash less irritating and quicken the recovery process by following these home remedies.