It will leave a scar and your skin will likely be discolored (slightly darker than your normal skin color).
My ringworm (see my first post) left my skin in that area discolored.
Most ringworm is pretty small; smaller than a dime. Larger areas, like mine, leave a noticeable discoloration.
Once the red ring is completely gone then the ringworm has gone beneath the skin and is on its way out. Keep applying the creme and/or spray for at least another week.