Cysts are fluid filled sacs and are not cancerous. Usually cysts form to enclose or "wall off" something that may be potentially harmful to the body. So while the cyst itself will not kill you, it may be your bodies way of telling you something is wrong.
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Not usually. Unless it is the result of some injury or disease. Most cysts are benign and can be removed by a dermatologist.
Many people have cysts internally and do not even know it. They are detected as part of a check for some other condition and show up on an ultrasound or some other diagnostic exam.
It is possible for you to eventually die of a cyst in the brain. The brain is enclosed in a solid envelope of bone (the skull), so there is no room for a cyst to grow without compressing the brain. As the cyst grows, there is less room for the brain and eventually this may become fatal. However, if the cyst doesn't grow, it is possible you could live a normal life with it.