Molluscum contagiosum is caused by a virus and usually causes a mild skin disease. The virus affects only the outer layer of skin and primarily affects children. The virus causes small white, pink, or flesh-colored raised bumps or growths with a dimple or pit in the center. The bumps are usually smooth and firm. In most people, the growths range from about the size of a pinhead to as large as a pencil eraser. The bumps may appear anywhere on the body, alone or in groups and may be itchy, red, swollen and/or sore.