Aloe mask.
When you sleep at night, pick a small piece of aloe leaf, peel it off and apply it to the scar. Wash it off when you get up the next day. It takes about half a month for the scar on the face to fade and the skin to turn white.
Summary: Don't rub it on your face overnight, it will usually wash off in about 20 minutes. It is normal that it will be itchy and cold when applied to your face, but if your skin is sensitive, dilute it with water before use.
If it's an acne scar,
I recommend you use your body.
The tea tree essential oil in the shop, the scar marks left by acne on my face, have faded a lot after using the tea tree essential oil, and are basically invisible. The effect is the most obvious at first, and it will obviously fade after three days of continuous use, but it will not be so obvious after a long time, so we should stick to using it every day. Now I have used more than half a bottle, and the acne marks are basically gone.