What Is The Mottling On The Front Of My Thighs?

I am a 45 year old female. I am 5'3" and within the last year or so have regained enough weight to be considered healthy (120)! (I got down to 97 pounds in 2009, due to health issues.)I was diagnosed with Ehlers-danlos syndrome in the 1980's -- also acquired Dengue Fever in 1988 while living in Puerto Rico. In the last couple of weeks or so I've noticed a mottling on the front of my thighs - mostly on the inner top portion of both thighs. SHould I be concerned?