It may have mites, take it to see a vet.
Mine doesn't.
If a hamster loses its hair, it usually means it has mites, but it could be something else.
The hamster will have red, flaky or sore skin, bald patches, thinning fur and matted fur. You may also be able to see the tiny bites or insects themselves. ALL animals with signs of skin disorders including mites should be taken to see the vet immediately.
If your dwarf hamster has signs of hair loss lots or itching and green hammy manure then these signs may be theresult of mites
No you cannot catch mites from a hamster. Mites are not zoophytic, meaning they cannot be transferred from animals to humans. They may make you itchy for a short while though if you have just touched an animal with a particularly bad case of mites, but they will die off completely in about an hour or so.
hamsters are prone to have diabetes, diarrhea, malocclusion, and mites.
If you are sure it is mites you need to take the hamster to the vets for a set of 3 injections which will cure him.
When my hamster had mites, the vet gave it three weekly injections (the hamster took it surprisingly well!), which sorted the problem perfectly. There are commercial remedies too, usually in the form of a spray. Make sure you cover the hamster's eyes well before you apply it.
It may be mites since they can get them sometimes. If they are very small like the dot a pencil would make and move around that is probably what they are.
Your hamster may have mites, so you should take them to the vet and have the vet check.
My guinea pig had a problem like this. She had mites. Take your hamster into the vet and if it is mites, she will get a series of shots.