I have no picture

TCA cross can work if they have defined borders and are small enough. Otherwise I would dermastamp them & subcision is best for this depending how deep it is. Nothing is generic in scars it depends on many things 😉

you have to zoom the image, in photos looks like is only hyperpigmentation, but noup, is a little deep 

Can u see the borders?

This isn't a scar it's PIE :-), aka post acne wounding. The best treatment for this is laser v-beam, excel v, 1064nm, or IPL. It will take several treatments. Some do heal but it can take a very long time. There are other diy treatments in the faq goto the top of the acne scar sub, find the faq (top post) and goto Skin > PIE.