Thanks for the answers to my questions. I'm assuming that it's not possible for you to post a picture of the bumps which you've found which is unfortunate since in this particular case, a picture truly would be worth a thousand words.
But, in the absence of one, several thoughts come to mind as to what might be going on with your lab:
1. These could be viral papillomas which you're seeing which are completely benign.
2. He could be experiencing an allergic reaction to something in his environment such as a chew toy or anything plastic such as food or water bowls (unless they're stainless or ceramic).
3. He could have canine acne which involves irritation of the hair follicles although he's a little on the older side for this condition.
4. There are other possibilities such as ringworm or demodex mites but these lesions tend to be flatter and not raised.
As to treatment options, it's going to be difficult to advise you without a clearer understanding of what these bumps might be but you could gently clean his skin with dilute over the counter Betadine or Iodine (to the color of weak tea) twice a day which certainly won't be harmful.
I'll sometimes advise benzyol peroxide based gels or ointments if canine acne might be present but am hesitant to suggest it if this isn't the problem.
This certainly isn't an ER type of situation but if more develop or if the current lesions persist, then it might be a good idea to have your vet examine him.
I hope this helps although I'm sorry that I can't provide a more precise answer. Deb