Welcome to EmpowHER and thanks for your question. Sound to me like it can be a skin infection called Molluscum contagiosum. It is caused by a virus of the same name that is part of the pox virus family. The virus is contagious through direct contact and is more common in children. However, the virus also can be spread by sexual contact and can occur in people with compromised immune systems. Molluscum contagiosum can spread on a single individual through scratching and rubbing. It's best to see your doctor and he can confirm the condition with a skin biopsy.
Best of luck,