My DD has a superficial hemangioma on her hand. It was much brighter and "scarier" looking for the first, oh, four months or so. I cried a lot. And of course the post partum hormones don't help! It was a struggle to take her out because people would always exclaim "Oh my what happened to her little hand" - or they would try to talk to me, but their eyes would keep drifting to her hand... and then as our conversation was closing (I'm putting my wallet in my purse or whatever) "Oh my! What happened..." I always felt everyone's eyes on me, wondering what I must have "done to her".
DH and I had a little game early on that we would play, coming up with really nasty responses... "I slammed it in the car door last week - do you think I should have it checked out?"... "We handle snakes at our church, and I guess baby wasn't ready yet"... "Its a rare form of rapidly progressing skin cancer and the doctors only give her 6 months..." ect. ect. ect. It was pretty bad. I'd be a crying snotty mess and he'd start in on this "game". It sounds awful, but it did help... even if it reminded me that it could be worse
Most of the time I am "nice" but it is hard to feel like you are the spokesperson for hemangiomas EVERY SINGLE TIME you leave the house. And the killer is when you explain, and then they come back with "Oh, my, well it really looks like _________. " Gee, thanks, my husband and I hadn't come up with that one yet! Fortunately, as baby's H has gotten lighter, we get fewer comments.
Sometimes, however, I do admit, that depending on the person, I like to reply with "Why do you want to know?" and then "hmmm" or "its really none of your bussiness". This really helps with rude people. It helps if you practice it like a mantra. If you get nervous you can start with "Excuse me?" or with more of an "?!?!"