my male ball python stomach just started turning a bright red i recently noticed get brighter after a recent feeding any insight on what it might be would be greatly appreciated.
just recently feed him a rat

Depends on what you fed it.
And what it has been eating.

Im not sure exactly but it could be some sort of rash or something. If it doesnt go away soon i would recommend taking it to the vet to get it checked out.

Another possibility other than the preshed color is some sort of burn or scale rot. I get the impression from your other posts that even though you arent much of a BP person you have enough experience with snakes in general to recognize something like that so Im mainly mentioning it for any one else that might read this thread trying to figure out what is wrong with their BP

Hemorrhaging of the stomach is a usual sign of bacterial infection in snakes. The belly scales turn reddish in some or all areas of the snakes belly. At this point the infection is on the belly of the snake but it can easily be fatal after spreading to the main body cavity. You need to take the snake to the vet as soon as possible to get it tested for bacterial infection. Antibiotics are generally prescribed to treat them and 90 make a full recovery. Dont waste time though because a bacterial infection progresses very rapidly.

The problem can be researched by the name of septicemia though technically this name only applies after it progresses to the body cavity.

The problem is caused by a too humid environment and too many feces.