Hello.
A one-year-old boy in blue heels. Goes to the dog park every day. He’s an aggressive sniffer around other dogs.
Blemishes do not disturb him.
I recently discovered that, so I’m not sure how long it has been there.
Thanks!
I would schedule an appointment with the veterinarian. Nobody on this site can give medical advise on something you don’t know about. Keep a watch on it to see whether it grows, bothers him, and so on; this is all useful information to provide your veterinarian.
(It reminds me of ringworm, but I haven’t personally experienced it). Even if it is, the dog should still visit a veterinarian.)
Thank you so much, Kajol 
Definitely take your dog to the veterinarian. If this were my dog, I would not wait; I would schedule an appointment as soon as possible so that the situation does not worsen.
Another vote for going to the Vet. Anything you can’t explain or know the origin of should be carefully analyzed.
I will surely consider seeing the vet.