My son's ball python has a horrible time shedding - he has had maybe two successful entire sheds in one and half year. The others I have had to "help". This time he shed back half and not head nor front end. I've let him have a go at it and now appears ready to do a full shed again - but he still has a lot on head that has not come off and it appears to be too much to shed. Eyes look bad ... worried and don't have a vet to treat here, although not sure that is what we need. Any help/advise?