And at a GE-sponsored conference, Grossman learned how to use direct mail to get women to come in and get their varicose veins zapped away.

FORBES: On The Cover/Top Stories

Poor circulation has a number of potential causes, including blocked arteries, varicose veins, liver or kidney disease, extreme cold, or as a side effect of certain drugs or medications.

CNN: Does my numb leg mean I have a circulation problem?

There are so many different treatment options for varicose veins, it's best to get a second opinion, according to Dr. Julie Fleishlag, chair of the department of surgery at Johns Hopkins.

CNN: Five diagnoses that call for a second opinion

In the last year five other similar technologies have been approved by the FDA. The most serious challenger to ThermoLase is Israel-based ESC Medical Systems, which makes lasers for treating varicose veins and for hair removal.

FORBES: Zapped!