Some By Mi AHA.BHA.PHA 30 Days Miracle Serum 50ml Vintage Blue and White Bus. The SOME BY MI AHA. BHA. PHA 30 Days Miracle Serum is a potent blend of 10,000ppm tea tree leaf water and 14. 5% centella extract that works wonders for your skin. This serum helps to soothe and moisturize while minimizing the appearance of pores. The AHA content delivers gentle yet highly effective exfoliation to remove dead skin cells and impurities from the skin surface. BHA, another hero ingredient, helps to remove impurities and sebum from within pores, while PHA works to prevent moisture loss in the skin. This serum is a game changer for those looking for a comprehensive solution to their skin concerns.