Directions to North Georgia Dermatology from Suwanee:

Take Lawrenceville-Suwanee Road all the way to Highway 120.
Cross Highway 120. You will pass the back side of Gwinnett Hospital.
The next intersection with a traffic light will be Old Norcross Road.
The building is on the left before the light -
    Turn left into the parking lot at 771 Terrace Park.