Scars on my legs

I have this scratched on my legs and I don't know when and where did I got it, I just have noticed it yesterday. I tried to remember the things I did the previous days but it's sad to say that I don't remember anything I did that would cause me a wound that would mark an ugly scar on my skin.

I am still thankful though because it's not on my face and I don't have any acne marks either or else I'll be using acne scar removal to remove the insightful mark. Good thing that there are creams that remove scars in todays time unlike before there was none reason why I have a lot of scar in different areas on my body.