



What azelaic acid is, how it calms breakouts, redness and dark marks, why it’s both a cosmetic and a prescription drug in Canada, and what the trials show.
How glycolic, lactic and salicylic acid exfoliate, which one suits which skin, why they make you sun-sensitive, how often to use them, and Canada’s rules on strength.
How salicylic acid works on clogged pores, how strong the acne evidence really is, what Health Canada’s acne monograph allows, and who should be careful with it.
Why retinoids and benzoyl peroxide leave skin dry, red and peeling, what studies show about adding a moisturizer, and practical ways to protect your barrier without giving up on acne treatment.