This sounds like alopecia areata of the legs. The same smooth, hairless patches that occur on the scalp or face can affect the legs. I can't think of another condition which would look like this. No treatment is likely to be useful. As with any case of alopecia, most people who have this aren't ill otherwise. It's pretty common--many who have it don't notice it because it's not in a cosmetically-sensitive location, or else there's not enough surrounding hair to make the contrast noticeable.
If your liver enzymes are normal, they're normal. Transient liver enzyme elevations are common and of no significance if they return to normal levels. Three confirmations seems like enough to me.
Best.
Dr. Rockoff
One thing to add to my post. I am a male and 40 years old.