It has been said and he is still posting asking what it is... Go to a vet and maybe find out?!
If you had a dog and it walked in with a random gouge the whole way down his back would you take it to the vets or just put some cream on it and 'wait and see'...
If the thread isn't for you then it isn't for you. Don't read it. That is the beauty of the internet, I can carry this and argue with him till the cows come home and you don't have to acknowledge my existence. I'm not being rude, just trying to state a point. This stuff gets on my nerves, it looks serious and he is so shocked by our reaction.