Osteochondromas, which usually develop between the ages of ten and 20, are the most common noncancerous primary bone tumors.
A history of noncancerous bone disease also increases bone-cancer risk.
Lichen planus-A noncancerous, chronic itchy skin disease that causes small, flat purple plaques on wrists, forearm, ankles.
Tuberous sclerosis is a genetic disorder in which noncancerous (benign) tumors grow on the brain, skin, kidneys, eyes, heart, and lungs.
The most common cause of acromegaly and gigantism is the development of a noncancerous tumor within the pituitary, called a pituitary adenoma.