Sebaceous cyst

INTRODUCTION:
  • Sebaceous cysts are common noncancerous cysts of the skin.
  • Cysts are abnormalities in the body that may contain liquid or semiliquid material.
  • Sebaceous cysts are mostly found on the face, neck,back, scrotum, or torso. 
  • They grow slowly and are not life-threatening, but they may become uncomfortable if they go unchecked.
ETIOLOGY:
  • Sebaceous cysts form out of your sebaceous gland. The sebaceous gland produces the oil called sebum that coats your hair and skin. Cysts can develop if the gland or its duct, the passage where oil is able to leave, becomes damaged or blocked. This usually occurs due to a trauma to the area.
  • The trauma may be a scratch, a surgical wound, or a skin condition, such as acne. Sebaceous cysts grow slowly, so the trauma may have occurred months or weeks before you notice the cyst.
  • Other causes of a sebaceous cyst may include:
  1. a misshapen or deformed duct
  2. damage to the cells during a surgery
  3. genetic conditions, such as Gardner’s syndrome or basal cell nevus syndrome
SYMPTOMS:
  • Small cysts are typically not painful. Large cysts can range from uncomfortable to considerably painful. Large cysts on the face and neck may cause pressure and pain.
  • This type of cyst is typically filled with white flakes of keratin, which is also a key element that makes up your skin and nails. Most cysts are soft to the touch.
  • Areas on the body where cysts are usually found include:
  • scalp
  • face
  • neck
  • back
  • A sebaceous cyst is considered unusual — and possibly cancerous — if it has the following characteristics:
  • a diameter that is larger than five centimeters
  • a fast rate of reoccurrence after being removed
  • signs of infection, such as redness, pain, or pus drainage
DIAGNOSIS:
  • CT scans, which help your doctor find the best route for surgery and spot abnormalities
  • ultrasounds, which identify the contents inside the cyst
  • punch biopsy, which involves removal of a small amount of tissue from the cyst to be examined in a laboratory for signs of cancer
TREATMENT:
  • The best treatment is to ensure complete removal through surgery
  • conventional wide excision: completely removes a cyst but can leave a long scar
  • minimal excision: causes minimal scarring but carries a risk that the cyst will return
  • laser with punch biopsy excision: the laser is used to make a small hole to drain cyst contents and the outer walls of the cyst are removed about a month later
COMPLICATIONS:
  • CHALAZION
  • Cock's peculiar tumour
Exam Question
  • Sebaceous cysts are mostly found on the face, neck,back, scrotum, or torso. 
  • Cocks peculiar tumor is actually a complication of sebaceous cyst.
  • Chalazion is sebaceous cyst

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