My little 7 year-old sister didn't know any better and started itching in that... private place. And now she told me that she felt a burning/stinging sensation when she went to the bathroom. I want to make her feel a little better, so my question is, how long does it usually take skin to heal? (It didn't bleed, but a little more scratching and it would've started to. About... one to two layers of skin are left). Thank you!