Completely unexpectedly, with no prior history, or obvious injury, I went to get out of my car and felt like my left ball of my foot had something stuck between foot and sandal. When I looked it was VERY swollen and somewhat painful, though more uncomfortable due to swelling. After a couple of hours it subsided enough that as a coach of runners I went ahead and shuffled carefully around for 30 min. It felt better and swelling went down , now it is VERY purple in color. This same foot has been experiencing some Achilles and heel pain but this ball of foot has never been a problem