Wax strips warning for facial use.

My daughters and I have used Veet wax strips many times.We were very please with this product. However,this last time when I had taken the wax strip off it had either rip skin off my right hand side of upper lip or I got a chemical burn.It has left a peeling,red and dry spot on my face. I didn't do nor use anything different before nor after. I used it as the directions stated.I don't have sensitive skin or any kind of skin problem. I am not allergic to anything that would explain this result . Not sure what has happened ,but I'm just hoping it isn't going to let a scar!Thank you for your time.