Sebaceous hyperplasia is a harmless skin condition involving the overgrowth or enlargement of the sebaceous glands. Sebaceous glands are attached to hair follicles all over your body. They release ...

A branchial cleft cyst is a type of birth defect in which a lump develops on one or both sides of your child’s neck or below the collarbone. This type of birth defect is also known as a branchial ...

• Sebaceous cysts are usually benign and sometimes go away on their own. • They're typically filled with keratin, a type of protein found in skin and nails. • Most of the time, they form on the neck, ...