My 5 year old son started biting his nails and the tip of his fingers over a month ago. I treid the over the counter solutions which is painted onto the nail and gives a bitter taste. Didn't work and while at the gp for another issue, i mentioned about the nail biting. The real problem is not biting the nails but he has started to bite the skin of his finger tips and along his fingers. It is so bad that his fingers have bled a few times due to biting too much skin off. He has always been a clingy child and quite shy but since starting school, has really come out of his shell so i don't understand what's happening. Perhaps because i have a 10 month old daughter, and that he always seems to get into trouble and told off and she doesn't? I don't thinkl he has any issues with his sister as he adores her and they get on well. Need urgent advice please!