Seborrhoeic Keratosis: Symptom and Causes


  • Start as small, rough bumps, then slowly thicken and develop a warty surface
  • Most often tan, brown, or black in color
  • May have a rough texture (like a wart)
  • Often appear in clusters
  • Range in size from a fraction of an inch to larger than a half-dollar
  • Form on the chest, back, stomach, scalp, face, neck, or other parts of the body (but not on the palms and soles)
  • Painless but may itch    
  • Having loosely adherent greasy keratin on the surface


The cause of seborrheic keratoses is unknown. It may occur due to
  • Ultraviolet light
  • Genetics
  • Stress

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