Mine just started last Wednesday, 10 days after I was exposed. I'm not healed yet but it's looking and feeling better. I think I read that the rash can last several weeks, and I'm sure it could leave scarring in some cases. There are products on the market that are supposed to minimize scarring (Mederma?) I've seen them at drugstores and WalMart. I would be willing to try if I do have scars. My rash is mainly on my hands and arms. Hope you're better soon....this is my first case and it's horrible. I love this website so I can communicate with other sufferers.