Dithranol — used to treat psoriasis
Tretinoin — used to treat acne or other skin disorders
Corticosteroids — hydrocortisone or betamethasone dipropionate
Petrolatum — a common ingredient in hair wax and gel
Already taking Finasteride for conditions other than hair loss (e.g. benign prostate enlargement)
Already taking other 5AR inhibitor (e.g. Dutasteride)