I have combination skin (dry and acne-prone skin with an oily T-zone). I’m currently testing COSRX centella ampoule, but haven't seen any improvement regarding my acne. It's really nice for hydrating, quite soothing and makes my skin super soft. There is a barely noticeable scent. I like to use it at night, but it is too heavy for day wear. It leaves a bit of a sticky residue on my skin and hands. I think this tacky feeling happens more for oily skin types than normal-to-dry types.

Note: “Use more drops of the ampule if you think it is necessary” – Cosrx.  Oh and yes this serum can be heavy if you put more than two drops on your face.

P.S. I've been using this product for about two weeks now, and I honestly can't say if it's done miracles or not. I will follow this, as I am searching for my HG as well.