Ideally, you should have a routine check every 6 - 9 months, but if you do have pain or
you spot abnormal signs between appointments, don't wait around.
They're harmless, but do keep an eye on the size and quantity of these
spots, since having six or more that are larger than a quarter may be a
sign of neurofibromatosis (a genetic disorder that causes
abnormal cell growth of the nerve tissue).