A prescription retinoid deserves a routine built around it, not against it.
Gentle cleanser, generous moisturizer, and morning sunscreen are the supporting cast. Niacinamide is usually welcome. Hyaluronic acid layers under moisturizer without conflict. Azelaic acid is often prescribed alongside tretinoin deliberately; that is a prescriber decision, made with your skin in front of them.
Applying moisturizer first and tretinoin on top slightly slows delivery and noticeably calms irritation. Many prescribers suggest it for the settling-in months. Ask yours before changing how you apply a prescription.
Oral isotretinoin makes skin fragile everywhere. Topical retinoids, acids, benzoyl peroxide, and scrubs generally pause for the whole course. Your dermatologist's list of what is allowed is the only list that matters.
Usually yes, in the morning under sunscreen, far from the evening tretinoin. If your skin is newly on tretinoin, add vitamin C only after the settling-in period.
Because they know your skin, your strength, and your goal. Dermatologists deliberately pair tretinoin with acids or benzoyl peroxide in specific plans. Their schedule wins, full stop.
The settling-in period commonly runs several weeks. Buffering, alternate nights, and generous moisturizer help. If irritation is not easing after that, tell your prescriber rather than pushing through.
A free iPhone app that knows the right order for your routine and warns you when ingredients clash. No account, no data collection, nothing to buy.