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Perineural cysts, which are also known as Tarlov cysts, are fluid-filled sacs that form on nerves at the base of the spine. A person with such cysts would likely never know it. They almost never cause symptoms. When they do cause symptoms, however, the most common is pain in the lower back, buttocks, and legs.
A sebaceous cyst is a type of cyst that forms in the epidermis, the outermost layer of the skin.A sebaceous cyst is also sometimes called an epidermal cyst. It forms when a sebaceous gland, an oil-producing gland in the skin, becomes blocked.This creates a sac that fills with a fatty yellow substance that can resemble cottage cheese.Sebaceous cysts can be present at birth or caused by skin trauma, swollen hair follicles, and high levels of testosterone. The primary symptom of a sebaceous cyst is a painless nodule or pale lump in the skin.Sebaceous cysts are very common. They are not cancerous and are generally not a serious condition.his creates a sac that fills with a fatty yellow substance that can resemble cottage cheese. Sebaceous cysts can be present at birth or caused by skin trauma, swollen hair follicles, and high levels of testosterone. The primary symptom of a sebaceous cyst is a painless nodule or pale lump in the skin.