Cyst types are based on where they originate. Both infundibular (aka epidermoid) and pilar cysts contain keratin and come from the epidermis or hair follicle. This is in contrast to sebaceous cysts that contain sebum. Regardless of origin, cysts may persist for years, become painful, and grow to a large size. Surgical excision is a simple outpatient procedure using local injections for numbing to remove the cyst sac and its contents.
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