Shît happens like this a lot, asked couple of MD's about...just get a non-answer.
Asked my dermatologist, he's trying to say it's from being old.
WTF....just turned 49
BS, got to be something else. Picking the campfire braintrust.
When I was 49 years old I had the same problem. Its caused by thin skin usually as a result of too much sun exposure.
If you have ever been on PRENISONE that will only make it worse.