Mites or colouration?

[Malum Argenteum]

What im worried about he’s not my only snake I have him in the reptile room with my 3 other snakes tge others are fine eating no sign of anything it’s just him

Once you get a collection of more than a couple snakes it is a good idea to take quarantining (isolation, testing, possibly prophylactic treatment for mites of any snake that comes from anywhere but directly from a 100% trusted breeder) seriously. Doing so would eliminate any mite worries in the future, but of course there are far more damaging things than mites to try to keep out a collection.