Dear Amy,
as I said in my previous answer, making your nails less sensitive is probably more convenient than putting bandaids on tips of your fingers. As I mentioned acrylic or silk wrap have been helpful for some sufferers. It is rather expensive to upkeep, but often worth the price. ;) you are not alone.
Thank you , I'm happy someone know how serious the problem is , I hope it'll work for me. I'm searching for ways to prevent this happening like bandage for nails or anything like this.. Any idea ?
It is a very difficult problem to get rid of. My best suggestion would be a very good quality lip product such as "Sugar" to keep your lips moist and soft. Another thing that has work for some people is doing your nail with acrylic or silk wrap, making them less able to "pick" at your lips. Those are a bit expensive and you need to do them every two to three weeks, but it has worked well for some. Good luck to you.