Thanks! The bumps do feel somewhat like nipples on the belly but they
generally are "scabby". What's interesting is they are only on the top part
of my cat, and not the bottom. They are all over the top of his neck, top
of his back and a lot by his tail. I'm almost wondering if he's not
crawling under something. We have 4 other cats and none of them have
anything similar so I'm not too sure how he'd be the only one to get them.

Our vet is clueless on it. We've heard it could be ringworms but the vet
disagrees. Unfortunately we'll have to go to the specialist/dermatologist
without a professional opinion from our vet.

Thanks for your feedback.

Sincerely,
Will

Sometimes a cat or dog for that matter will have an allergic reaction to
flea bites. You may think he doesn't have fleas because sometimes the little
guys jump on bite then jump off. Flea collars often keep the fleas from
staying but that doesn't mean they will not taste you cat.

Some cats are like my wife and will get a really big bump from the bite!
This might be what's going on. Mosquito can also be a big problem. These
flying critters just don't bite people you know! Also flea collars don't
always work with mosquitoes. Do you have a problem with mosquitoes. There
are also a number of critters that can live in carpeting. Some of these
critters bite and can cause skin irritations. There are many different types
of mites and some could cause problems.

Food allergies cause different types of welts! Usually these welts are not
as pointed but more rounded. They are also very close together where bites
are more apart from one another. Shave the cat so you can get a really good
look at the skin. What's the color of the welts, what's the spacing of the
welts. What are the welt surfaces like!
Are they pussy? Can you pop them? Do they have any kind of head on them? You
might take a few pictures and put them on the net!

Hope I helped!