Gill slit cysts are congenital disorders with significant symptoms that can occur at any age and are generally considered to be of equal prevalence in both sexes, with no difference between the left and right sides. Gill slit cysts appear as spherical or hemispherical cysts that are soft, relatively elastic, usually elevated above the skin surface, mobile, and relatively well defined. Those without conscious symptoms have a leaky canal that can squeeze out a tofu-like substance, singly or in multiples, usually on the head, face and neck. It is more common in adolescents and children, and sometimes the gill slit cysts are red, swollen, painful, and break down and flow pus. Generally, gill slit cysts do not become malignant and are usually best removed surgically.