Alcohol Denat. can be difficult for seborrheic dermatitis when it appears high in a leave-on formula, because it may sting or feel drying on an already damaged barrier. A small amount in a well-balanced or rinse-off product is a different exposure, so context matters.

This is the volatile type of alcohol, unlike waxy fatty alcohols such as Cetyl Alcohol. The checked sources do not give it a seb derm treatment or yeast-control role. If a product consistently leaves skin tight, burning or red, it is probably not a good fit during a flare.