I had a blood test a week or so ago, and have a colorful bruise as a result. Then I walked too close past a neighbor's shrub and got two parallel scratches across my lower arm. But they are fading, and the lower one would already be very difficult to see without the first one. Soon there will be no trace of either scratch, nor of the bruise.
Sometimes I imagine what it would be like if we were like dolls or other objects that chip and get stained and cracked. Of course, I know that some things don't heal to the point that they are like new again, and we carry scars. But the fact that we heal at all is a source of wonder to me.