Please get your snake to a veterinarian ASAP
Anytime a snake has unexplained lesions or discoloration on its body there is a cause for concern. Septicemia will typically show up as a very pink or red spotted belly when it first shows signs. The body lesions are more advanced signs. It may be the lighting, but that snake does look quite a bit pink.
The other possibilities can be early signs of a burn or rot... Which is still a reason to go to the vet.
However... just to rule out some other possible causes:
Is there anything that the snake may have leaned on or dug into to discolor the skin? Dirty bedding?
How is the temp/humidity levels in the habitat?
Does the snake eat f/t food or did it possibly get bit by the last meal?
Did the snake show any signs of starting to shed? Blue/cloudy eyecaps maybe? Some snakes look more pink when they're going into shed.
I still do recommend going to the vet. ASAP
The combo of body discoloration and wheezing can be quite serious! And especially if there has been sudden weight loss or lethargy.