I have noticed this too. It’s not just my face either, it is my bikini line too. I work out often now and get so sweaty. It could be that for me. I’m not sure. I never thought about the surgery causing it.
Maybe it’s just a summer or hot weather thing? I’m washing with cold water and laying off my regular moisturizer. A challenge for me right now is sunscreen. Even the lighter ones make me feel and look greasy!