Medical Dictionary: Molluscum contagiosum
Molluscum contagiosum is a relatively common viral infection of the skin that results in round, firm, painless bumps ranging in size from a pinhead to a pencil eraser. If the bumps are scratched or injured, the infection can spread to surrounding skin. Though most common in children, molluscum contagiosum can affect adults as well, particularly those with weakened immune systems. Molluscum contagiosum spreads through direct person-to-person contact and through contact with contaminated objects. The bumps charistically have a small indentation or dot at the center and may be itchy. The bumps usually appear on the face, neck, armpits, arms and tops of the hands in children, but may be seen on the genitals, lower abdomen and inner upper thighs in adults if the infection was sexually transmitted. The bumps associated with molluscum contagiosum usually disappear within a year without treatment but doctor-assisted removal is also an option.
Source: Mayo Clinic