If you ask me one best and affordable skincare active which targets both acne and pigmentation which most of us face these days, it's our Niacinamide. It's a form of vitamin B3 and is such a great calming agent which is also a chemical exfoliant. I have used the Plum Niacinamide Serum and found it very soothing unlike other niacinamide based formulas, which was also affordable. This soothing effect is because of the Squalene and Rice Extracts present in it.