Let's review. An ephelis, or freckle, is a type of macule, which is a small (up to 1cm in diameter), circumscribed, flat, and thus nonpalpable change in the pigmentation of the skin. By nonpalpable, I mean you can't feel it. Or more specifically, you can't feel any difference between it and the surrounding 'normal' skin.
The troy ounce is the standard silver price that you see on the t.v. 1 troy ounce = 31.1034768 grams or 1.09714 U.S. Ounces. It is usually just referred to as an oz.
How does silver price per troy ounce differ from silver price per gram? Silver is generally sold in troy ounces, which are different from grams. There are over 31 grams in a single troy ounce, so the silver ounce price will be higher than the silver price per gram. With that being said, the price per ounce is generally lower when you purchase more units.