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Yes, it is quite common for hamsters to develop tumors, and they are very prone to cancer as they get older. The most common type of cancer is in the thyroid, but it is not uncommon for a hamster to grow a fatal skin tumor.
Sometimes a serious absess can be caused by an infected cut or wound to the skin. These often occur inside the hamster's mouth or cheek pouch, where a hard seed has cut into the flesh or become embedded. An absess, if not treated, will develop into a hard painful lump, but veterinary treatment is possible. A vet will quickly drain the absess and inject antibiotics.
Your hamster lived for two years, and hamsters only have a short life expectancy, but it is a sad story. Are you going to replace him?
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