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How long should it take for an allergic rash to heal (see details)?
If someone has a skin rash due to contact with an allergen, how long should it take for the rash to go away once contact with that allergen has ceased?
Backstory: I think I might be allergic to my new laundry detergent. I’ve rewashed my clothes in my old detergent, but I’m still pretty itchy. So I’m wondering how long I should wait before deciding something else is causing my rash.