Can you peel off too much sunburn?

My aunt is obsessed with being tan and frequents tanning salons more than she should.

My.uncle has tried to dissuade her from going to tanning beds so often by reminding of the possible skin cancer risk, but she refuses to listen.

Yesterday, I went over their to hang out with my cousins and found my uncle peeling my aunt's back after she'd come back from another tanning bed session.

He peeled straight across from her right shoulder to her left shoulder and down to the small of her back. So, he had peeled basically the size of a large sheet of paper of dead skin off her back.

We were both understandably alarmed especially when she wanted him to.keep peeling. He told her then and there that she had to stop going to the tanning salons/beds because peeling that much off her back couldn't be healthy.

He put the huge paper-sized piece of dead skin that'd peeled off in a plastic bag because he immediately made her an appointment with his dermatologist so he could tell her how dangerous tanning beds are and how dangerous peeling that much skin could be.

I mean my uncle got really upset. The part of the dead skin facing him was coarse and faded while the part he'd peeled off that was attached to her back was shiny and smooth. He didn't know if this was normal, which freaked him.out even more. Is it normal?

Their appointment isn't until Monday so he asked him to ask around if this sounds dangerous b/c He+s technically challenged when t comes to certain aspects of the Internet.

Thanks to anyone who has some advice.