got the pic
he doesn't look too skinny to me
their bodies tend to be not quite like ribbons - sort of between garters and ribbons
but he's likely to have parasites either way
if you can get him to a vet, that would be great
when you make an appointment, make sure the vet is experienced with reptiles
if they aren't, they may still be able to run a fecal check for you, so ask
but also be aware that some parasites may not show up in the stool
there are some that will just show up after a few months subcutaneously
best to keep this snake separate from others for a while
when I had mine, I never did keep them with any others