Bunnies can develop various lumps and bumps on and under their skin. The most common forms of lumps and bumps are abscesses, benign growths and malignant cancer growths.
Abscesses are puss filled pockets caused by an infection. They can rapidly increase in size and are usually smooth. When squeezed, they have some give to them similar to squeezing a water balloon.
Benign growths are masses of cells that lack the ability to spread to other tissues. They are often called benign tumors. They come in many shapes and sizes. Some may appear and then dissipate on their own, while others obtain a certain size then never go away or change in size or shape. Some benign growths have a warty look and are quite firm, while others may be soft and smooth.
Malignant growths are masses of cells that grow and spread uncontrollably. These types of growths are commonly called cancer. Unfortunately, other than surgical removal, there are no other treatments for cancer in rabbits. Even surgical removal is not always successful if all of the cancer cells are not removed. Most malignant growths in rabbits are internal affecting components of the reproductive system, liver, kidneys and bladder. However, these internal malignant growths can become visible as the cells invade and spread throughout the body.