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.
The Price of Silver per Ounce is usually referred to as the Spot Price. The Silver Spot Price is updated minute by minute and can fluctuate quite rapidly depending on current market conditions. When buying and selling silver by the ounce, it is industry standard to measure it in Troy Ounces which is about 1.10 regular or Avoirdupois ounces.