What you are looking at is most likely the needle holes where the loop was sewn for the spline that slides into the channel that holds the end of the awning against the coach sidewall. The awnings do weather and stretch over time with exposure to the elements.
There is a metal cover made to protect the awning. Something like this: Dometic 21' Polar White Metal Weathershield - Awnings - Hardware
At this point, I suggest you just put some 303 Protectant or Awning Armor on the closed awning to make it last as long as possible then just replace the fabric with your favorite color. YMMV