I had a cyst removed from my uterus and soon after my clitoral hood and minor labia around it turned dark purple and soon so purple it looked black, and my clitoral hood fell off...now it s pretty much normal colored again but I still have blisters on my anus. What would cause my hood to fall off and why would I have these blisters. I had the surgery in 2010 and still have the blister issues.