New York Post may be compensated and/or receive an affiliate commission if you buy through our links. Dealing with hormonal acne and blackheads can do a number on your skin’s appearance — and your confidence. Thanks to the tried-and-true skin-clearing ingredient known as salicylic acid, those pesky bumps, scares and inflamed patches can soon be mitigated. After all, with so many ingredients specially infused into serums and creams, it can be difficult to find one that works for your skin. Like hyaluronic acid for plumping the skin, niacinamide for helping to reduce pores and retinol to carry over some anti-aging benefits, S.A. will be your next best friend for your…