Neck. Hand. Chest. In that order.
This time, it's the inside of my thigh. I'm hoping it was just a glancing blow, an inadvertent collision. When I felt it happen, I immediately stopped to check for and remove a stinger, but didn't see one.
Of course it has now also begun to swell. I'm hoping my right leg doesn't eventually take on the appearance of a fully grown adult manatee.