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Cysts have many causes, and common ones include tumors, cellular defects, errors in embryonic development and blockages of ducts in the body. Some cysts contain malignant cells, but most of them are benign, according to MedicineNet.


Causes of back cysts include sun exposure, acne, trauma, developmental defects and hereditary diseases, such as Gardner’s syndrome and basal cell nevus syndrome, according to Healthline. Sebaceous cysts and epidermoid cysts are two types of cysts that appear on the back, and each have distinct cause


One cause of cysts on the face and scalp is inflammation of a hair follicle, also known as folliculitis. This type of cyst can sometimes be identified by the presence of a hair follicle at its center, according to WebMD. Folliculitis is more common in diabetics, people who are severely overweight an


Skins cysts are closed pockets of tissue that can be filled with pus, fluid or other matter, according to WebMD. They are non-cancerous, can appear anywhere on the body and can feel like large peas under the surface of the skin.


A bone cyst is a hole filled with fluid that develops inside a bone, according to WebMD. Children and young adults are vulnerable to this condition. Bone cysts do not cause any symptoms, they have no cancer cells and they do not pose any health risks.


A complex cyst has both fluid-filled and solid parts. While a simple cyst only has fluid inside it and is usually not cancerous, a complex cyst can be cancerous. After diagnosticians find a complex mass, they take a sample to find out whether it contains cancer, reports eMedicineHealth.


A brain cyst is not a tumor but is a tumor-like sphere filled with fluid, notes the American Brain Tumor Association. Besides fluid, a cyst may be filled with blood, tissue or tumor cells. Generally noncancerous, brain cysts can interfere with vital functions due to location in the brain.


Some cysts are painful for dogs and some are not as it depends on the type of the cyst as well as where it is located. One cyst, in particular, that is painful for dogs is the ear cyst, also known as chloesteatoma.


Applying a warm, wet washcloth to a cyst for 20 to 30 minutes can successfully treat it at home, explains WebMD. This should be done three to four times a day, but a person should use caution as to not burn the skin.


Cysts appear in many sizes, from small enough to require a microscope for viewing to large enough to displace organs, explains MedicineNet. Since attempting to burst a cyst on one's own can sometimes worsen the problem, cysts are best evaluated and treated by a doctor.