Hello. About 5 days ago, I noticed a brown spot on the ball of my foot, about the size of a dime (the skin turned brown). It looks like a birth-mark. It doesn't hurt if I push it or when I walk. The area is also a little "puffy". I wouldn't say that it's swollen, and it's not "puffy" enough to notice that it sticks out, but if I run my finger over it, I can tell it's a little above the rest of the skin on my foot. Does anyone have any idea what this is?