I'm not sure of the pigmentation irregularities.
I do know that in Traditional Chinese Medicine, dark circles around the eyes can indicate adrenal exhaustion and HPA axis imbalance. How is your stress level? Perhaps some adaptogenic herbal teas will be helpful, gentle yoga, breathing exercises, and taking walks in nature I find to be very healing. One of my favorite calming teas is Tulsi or Holy Basil. Yum! Smells great, tastes mild even without honey. I grew some in my garden this summer in N. NJ.
One of the best herbs to tonify the bowel is an Ayurvedic formula called Triphala; best to use in powder form. Take 1 tsp. in 8 oz. of hot water. Steep 5 mins. then add honey. And do the best you can to drink it all; tastes horrible! It really helps the bowel and it's non-addicting like most laxatives. And, yes, aloe vera juice is wonderful for softening the stool and soothing the mucus membranes of the intestines.
To Good Health!
Theresa Nartana