Hi and welcome!
It is rather difficult to see what exactly is wrong from your picture, as it is not quite sharp, but it doesn't look quite right. Better have him checked by a vet who can really handle, diagnose and treat your boy and not just make guesses.
As we have members from all over the world, we find it very helpful if you please added your country, state or (for the UK) your county or city to your details, so we can always tailor any advice to what is available and possible for you straight away. Please click on your username on the top bar, then go tp erpsonal details and scroll down to location. Thanks!