Hyaluronic acid. Niacinamide. Retinol. Salicylic acid. The listing of active components we really like slathering on our pores and skin goes on. But, even though you may possibly combine and match serums to curate a personalized skin-care regime, know that there are some ingredients that really don’t play wonderful with each other. Some combinations can bring about irritation, although some others will lower merchandise efficacy, which implies you’ll want to pay near consideration to what (and how) you might be applying. “The biggest difficulty with mixing particular actives, or pores and skin-treatment components, is they can trigger dryness, burning, stinging, or redness of the skin” and, often, discoloration, claims Caren…