



How retinoids work on acne and aging skin, why retinol is a cosmetic while adapalene and tretinoin need a prescription in Canada, and how to handle irritation, sun and pregnancy.
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.
How to pick a cleanser, moisturizer and leave-on products for acne-prone skin: light textures, what “non-comedogenic” and “oil-free” signal, and when to see a doctor.
How benzoyl peroxide kills acne bacteria without breeding resistance, what Health Canada allows, how to handle dryness and bleached towels, and what the benzene findings really mean.