Why do people stare at my scars yet don't ask how I got them?

There could be a lot of reasons for why nobody asks how you got your scars and its not because they don't care. One reason why they wouldn't ask is that they are afraid of the answer and would rather live not knowing. People may not ask because they think the conversation will be awkward for both of you or that you don't want them to ask. Another reason for someone not asking is that they don't know how you'll react to them bringing something up that could just hurt you more. There could be a rare occasion where someone just doesn't care but usually, people are just afraid.

Some people are unsure and/or don’t understand. It’s natural for a person to see something they don’t quite understand and stare. Some people will also be kind enough to not ask questions to not invade your space or make you self conscious or be rude. Always try to remember if someone is staring yet not saying anything they are probably trying to work out in their heads what is going on, or some could even have scars themselves. It’s a completely natural thing for a person to do and although it may be uncomfortable try not to let it bother you.