iliyh

I just cleaned my car last night and noiced a crack (or is it a seam) on the the two side mirror's metal. I'm not sure what they are, but they both look identical, is the mirror housing sealed together by two pieces of metal or are they cracks? They both look the same, to me anyways and I can feel it with my fingers. Didn't notice it before. My 02 TL is only 2 months old and we had some really cold weather here last week which is about -14C at night and some heavy snowfall. Could that have caused it? Anybody else had this crack on their mirror metal???