You've not said where the spots are. If they're on your scalp or on your feet (or possibly betwwen your fingers), then they might be cause by the ringworm fungus - anywhere else and they're probably not. (The symptoms vary from one part of the body to another).
If it is ringworm, don't panic - you've probably had it several times already! If you've had athlete's foot, you've had ring worm (it just has a different name when it attacks your feet). If you're male and had 'jock itch', you've probably had ring worm. If you've ever had patches of dry, scaly skin then, quite likely it was ringworm.
Ringworm is harder to treat with cats than with people simply because all that fur makes it harder to apply creams to the skin.
Go to your doctor by all means but if it is ringworm (and it's not on your scalp) all he'll probably do is to prescribe 1% Clotrimazole cream which you can buy from your local pharmacy anyway. (It's usually sold under the brand name 'Canesten').
Information about ringworm in pets (and the possibility of owners catching it) is here:
http://www.marvistavet.com/html/body_ringworm.html
Hoping this helps,
Chris