Cysts can vary in size and appearance. They may be small and barely noticeable, or they may be larger and more visible. A cyst may appear as a bump or swelling on the surface of the skin, and it may be smooth or firm to the touch. Some cysts may contain fluid that is clear or slightly cloudy, while others may contain a more solid material. In some cases, a cyst may be accompanied by other signs, such as redness, swelling, or heat in the affected area. It is important to have a cyst evaluated by a veterinarian to determine the cause and the appropriate treatment.