I bruise very easily, and so quite often I discover what I call “mystery bruises” on myself. Usually they’re on my legs, and of the correct height that I can guess they were caused by walking into the edge of the open door of the dishwasher, or catching a laundry hamper on my shins as I dropped it. Or they’re on my hips, from an enthusiastic lover’s grab! But now and then, one shows up that I absolutely can’t figure out:

That’s not dirt on my thumb joint there (where it’s dark and brownish), it’s a 2-day-old bruise that’s 1.5 inches long! When I discovered it, night before last, it was rather swollen and deep blue from the blood pooling under the skin — and it hurt a lot! I have absolutely no clue how I could have bruised the second joint of my thumb. It’s just freaking weird.