myfs_109180

You definitely want to consult someone familiar with east asian medicine and qi flow in the body. A specialist can tell you whether or not it's something to worry about and based on the location, if there is a problem, tell you what's wrong. It's written that if it is a problematic black spot it means "stagnation of qi, degeneration of organ, or stagnancy due to an old injury."(Yang, 1998)