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      learn Tretinoin

      Vitamin A retinoid cream, prescribed for acne

      learn Finasteride

      • Are there really risks with topical finasteride? Reports on topical finasteride describe scalp irritation and dermatitis as the effects specific to it, and blood levels lower than the oral drug; whether the oral drug's systemic side effects (sexual, mood, suicidal-thought, cognitive and breast/semen effects, some reported to persist after stopping) are genuinely rarer on the topical form has not been measured in a trial powered to answer it. Both forms are prescription-only and contraindicated around pregnancy.

      learn Azelaic Acid

      • Is azelaic acid safe to use daily long-term? Azelaic acid has a long tolerability record on facial skin in acne and rosacea, where side effects are local and usually mild — but for daily long-term scalp use the only trial is one six-month study in 26 women, in which mild itching was the main adverse effect, so long-term scalp safety is not established.