Identification Mark

Tweet

While filling out a passport application they ask the above question name some of your identification mark. Could you share with me your answer? Mine, A acid mark on my right hand. That is while I was 3 years old my grand parents were having gold mining inside their house thinking that it is coconut oil i dropped that acid on my hand and that formed a mark luckily if some more drops would have fallen there would have been a hole in my right hand. Do you have anything like this? If yes, what's that?