My son is 8 (almost 9) and we have a very good relationship. However I've recently discovered that when he's upset or frustrated he is biting himself. If I tell him off or he finds a piece of homework difficult (basically anything that make him angry or frustrated) he will bite his finger. Trouble is he's biting it really hard and I'm concerned about where this behaviour will lead to and what I can do about it. He's a lovely chap and we have a great relationship however he does have extra lessons at school as he is very behind. We have an open relationship and I believe that we're good parents but I'm at a loss as to what to do about this nor what has brought it on. Any advice from other parents who have had this would be great as he's doing it more and more.
Thanks

i think you need to take him to a doctor of somesort.

it dont mean you are bad parents necessarily or that anything has happened to trigger this. sometimes these things just develop and no1 knows why.

I am an ex self harmer and what your son is doing doesn't sound like a prelude to anything, just frustration, same as a toddler might bang his head. Most people at some point in there life will have done something similar out of sheer frustration. I do think though that if given enough attention for it it has potential to turn into more just as any problem can escalate given the right/wrong attention. Having said that though, if you have believe he has reason to turn to self harm you should take him to a doctor and get advise and help him learn to cope with his frustrations better as unfortunately life is full of them.