Hi,
Lumps n Bumps are common occurrences on any part of the body. They are usually benign however they sometimes can be unsightly or cause irritation. There are some syndromes that are associated with multiple cysts/lipoma (collection of fat) if there are many all over your body. They don't naturally disappear on their own and depending yourself they can be left alone if you don't mind them. Just don't scratch or "pick" at them as that may result in infection and/or ulceration.
Excision under local anesthetic is a quick and cheap way of getting rid of them. One should be sent to the lab to be a 100% sure on the exact diagnosis of what they are.