So, you understand how bad my friend's mistake was. Wan't funny to her…but after all healed, she could laugh about it...Yup. That will take you to your local poison control center.
I had bad acne as a kid. Dermatologist prescribed Retin-A. I slathered it on the first night, got up the next morning and stumbled out half asleep to the rest of the house (my sister was in the bathroom). We had a guest that had spent the night and he was sitting at the dinner table. I sat down, exchanged pleasantries, then headed off to take a shower and get dressed when I heard my sister vacate the bathroom.
Getting into the bathroom I glanced into the mirror and saw that the outer layer of skin was completely hanging off my face in many places.
I can't believe the guest didn't say anything. I never used it again.
I am still mortified, decades later.