I ve been using new makeup which contains hyaluronic acid for a couple of weeks and now have what looks like either an aggravation of latent rosacea , or an acne breakout on my cheeks and nose. I m 67 and only have a single, very occasional pimple if I put on too much moisturizer. Usually these go away quite quickly if I use DHC Acne Spot Tx. But these are very stubborn and not going away. I checked the makeup s massive ingredient list, and didn t see anything else that could obviously be the culprit like oils, shea butter, etc. So I suspect it s the HA, as I ve never used makeup before with HA in it, and never had this reaction.