I don't think this is a normal shed at all. It looks like your snake is developing some serious scale rot, or a burn.

The scales that are discolored, are they chipping at all? Peeling and shriveling?

Please get him to a qualified herp vet ASAP.

Call the vet's office and see if they advise giving peroxide baths (half peroxide, half warm water) to clean up any bacteria.

In the meantime, get him on paper or paper towels, just the bare necessities. Also, check and make sure your UTH isn't too hot or broken.

Let us know how it goes.