Hard to see what you're looking at from that angle. Maybe someone more educated in veterinary services can help but my suggestion would be take it to the vet. If he/she is a puppy then you'll be up and down to the vet for shots and dewormers and all sorts anyways, so just get a checkup while you're there and point it out to the vet. Prevention is better than cure.
Also not seeing anything, normal looking skin, no bumps or nothing. Unlikely to be very sick at this age, but I second getting it checked if you're worried.
If it's something you can see, you could try zooming out a little and a few different angles, it's often hard to get good pictures of these things. However if it's something you can only feel, you're unlikely to get a definitive response without a vet feeling it up.