I am a 28 year old, active male. In the last two to three years, I have noticed a problem that on both shins that I can press in and it leaves an indention for a period of time. I can run my finger down the middle of my shin and leave a "crease" in the middle of my leg from around 2 in below my knee to 2 in above my ankle. Sometimes, this indentions can be enough to put hide half a dime in. Is there a need to worry about this?