Most lumps and bumps will need a vet to take a look at and possibly do a very inexpensive test called Fine Needle Aspiration. A small needle is used to aspirate a few cells from the growth. This is not a painful procedure and does not require anesthesia. Once the cells are aspirated, they are then smeared on a slide and stained for viewing under the microscope. This will help the vet have a better idea of what you may be dealing with. Any lumps and bumps need to be checked out because some forms of cancer may mimic innocent looking warts. For example, mast cell tumors are known as the "great imitator" because it can take many forms.