I always get the red marks where the patch was and they stay with me for about 3-4 weeks before they fade. After a week or two they are ONLY visible when I have a flare or after I take a hot bath (which is every day). Don't know what that's all about...but for me it's been that way since I started wearing them. I also rotate them and don't have them in the same spot ever. I actually usually place them AFTER a hot bath so I can make sure they're not in a spot they've been before...