What is the difference between a cyst and a boil?

A cyst is a closed sac filled with liquid, semi-solid, or gaseous material, typically benign and may not cause symptoms unless it becomes infected or inflamed. A boil, on the other hand, is a painful, pus-filled bump that forms due to an infection of hair follicles or oil glands, usually caused by bacteria. While cysts can develop anywhere on the body, boils primarily occur in areas where friction and sweat are common. Treatment may vary, with cysts often requiring drainage or removal, while boils may need antibiotics or drainage if they become severe.