Dark spots are a natural part of the aging process, and they can be caused by many different factors. Often, they appear as... moreDark spots are a natural part of the aging process, and they can be caused by many different factors. Often, they appear as freckles or moles, but they can also be a sign of something more serious, such as low testosterone levels. It's a good idea to keep an eye on your skin for any signs of these issues so that you can get them checked out sooner rather than later.