Acne scars are formed by pustules. So, if you almost never have that form of pimple, you wouldn't have scaring. Your description sounds familiar though. Do you have Rosacea?
[url]http://www.nlm.nih.gov/medlineplus/rosacea.html[/url]
The above webpage as a link to pics of what Rosacea looks like, if that helps.
Here's their description:
"Rosacea, sometimes called adult acne, is a chronic inflammation of the face of unknown cause and without a permanent cure. Four different types of rosacea have been described:
"Red face" rosacea, with a tendency to face flushing (or blushing), which can progress to a persistent redness of the nose or central face
"Acne"-like bumps and/or pus-filled lesions (papulopustular rosacea), with or without a red face or flushing
Rhinophyma – slow enlargement of oil glands and skin thickening of the nose and sometimes other facial areas, usually in men
Eye problems (ocular rosacea), which may occur before skin changes – a burning or gritty feeling may be present as well as reddening of the eyes and lids." 
