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.
A 90% silver dime, with silver trading at $100 per troy ounce, would be valued at a little over $7.00, versus a silver eagle containing 1 troy ounce of silver at $100.00. Thus, the silver dime could be a more efficient medium of exchange for lower priced goods.