People make stupid comments to me as well,I bruise very easy and have bruises all over my arms and legs, people will say, " did you have a fight with your husband?" My is answer now is " Yeah, but you should see what he looks like."
I also have Livedo reticularis, it is a purple fishnet like pattern on my arms and knees, people will ask me why i look so purple and I tell them, "I used to be a smurf, but the color is fading."
Just do what you need to do and ignore peoples comments.
I mean I have people ask me nicely, " what happened to you?" and I will tell them. But most of the time I am just tired of explaining, because most people don't know what Lupus is.
I may have been dealt a bad hand, but at least I'm still playing with a full deck. ( most of the time anyway).