Rodent ulcers do not spread in the body but need to be treated as early as possible to minimise the amount of tissue which needs to be removed in their treatment Rodent ulcers are harmless skin cancers The edge of the rodent ulcer is marked with a pen and a ring of normal tissue is also marked to help ensure that the rodent ulcer is completely removed Another name for a rodent ulcer is a Basal Cell Carcinoma The pathologists check to see if the skin lesion is a) what we thought it was and b) that it is completely removed