Yes, He's had all this shots Rabies,5in1 and kennel cough maybe that's it.
When i brought him in the vets last time she notied it and did'nt seem to be worried about it she asked it he scrached or anything at it but that was it.
It does'nt seem to bother him so i think it might be from something like.
It just something that caught my attention.

Thanks Wolf Q and flatcoatlover for the info i'm not going to worry unless he starts messing with it