Just a personal opinion obviously, but in my book there is no need to cover up just because one happens to have scars or whatever.
If there's a medical need; by all means DO it and don't even reconsider it. Health is what counts over what others might or might not think.
If it's something you are poundering out of emotions, esthetics or any of the alikes; stop it and never allow yourself to be limited just because of something that is and you can not change. It's time and energy wasted that you can very well spent on nicer things.
Personal experience? I do not cover up antyhing for anybody. Have a nice collection of scars that continues to grow, got a urinostomy, PEG-tube, one finger amputated and some more but no way I will cover up. Nothing to be ashamed of what so ever. I'll use waterproof adhesives to keep the PEG in place and patch of the urinostomy but the adhesives that works the best for me are see through. Coulnd't care less. Most folks don't even realise, can't quite put together what they just noticed, if they noticed anything to begin with and so yes; what it was. Can be nice entertainment when bored out of my mind.

The only moments of covering up are when medically needed, like with a new scar. Not that it would help a lot since I'll only cover up the scar itself and the covering of that tends to just result in people going "ahhhhhhhh something going on, let's have a closer look". All in all I am a firm believer in going with what works for me. Constantly investing time and energy in covering up is a waste of both for me. What others might or might not think about that is their problem. People will always find something to have an opinion about, even when they don't have an opinion. So let's give them something to be opinionated about.
