Today I noticed a very small dent on my Bianchi Pista's seat tube. It's very small and I only found it because of the way the light hit it. If I run my hand over the area I can just feel a shallow spot. The bike isn't that old and I've never hit the area so I'm guessing it came that way. My question: is it safe to ride? I certainly don't need a tube failure while going down a hill at 30 mph. I suspect this isn't an issue but I figured someone here could answer the question better than me. I've attached a picture but you can't really see anything other than a slight diffraction of the light.