A sebaceous cyst is a type of cyst that forms in the epidermis, the outermost layer of the skin. A sebaceous cyst is also sometimes called an epidermal cyst.It forms when a sebaceous gland, an oil-producing gland in the skin, becomes blocked.This creates a sac that fills with a fatty yellow substance that can resemble cottage cheese. sebaceous cyst is a type of cyst that forms in the epidermis, the outermost layer of the skin. A sebaceous cyst is also sometimes called an epidermal cyst.
Webster Dictionary(0.00 / 0 votes)Rate this definition: 1  Unbidden(adj) not bidden; not commanded. 2  Unbidden(adj) uninvited; as, unbidden guests. 3  Unbidden(adj) being without a prayer.
Something unforeseen is something that could not be predicted and was not expected. It's a surprise. If something was foreseen, you saw it coming and it wasn't a surprise. Something unforeseen is the opposite: no one saw it coming. Accidents are usually unforeseen events: no one expects to get in a car or bike accident on a given day. Winning the lottery, since it's so unlikely, would be an unforeseen event.