How long will it take for my skin to grow back?

Okay so, I got a REALLY bad sunburn a few days ago and my face got really burned and it recently started blistering. Not being really sure of the consiquences, I started to peel at my blisters. My mom caught me and told me to stop so I did. Now I have a little area on my forehead thats reddish-pink from where I was picking. My mom said I just have to wait till my skin grows back but, how long do you think/know that can take?