Blocked gland: A sebaceous cyst is a collection of oily fluid that occurs when an oil gland is blocked. Some folks are more prone to them than other and they often appear on the neck, shoulders, and back. Avoid skin products that are oily. I would also stay away from transfats and bad oils, which is good for overall health. Saunas and sweating may help although i don't of data. See doc for exam and diagnosis.
Answered 7/22/2017
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