Since you know a lot about this, can you tell me about diary allergies that cause skin reactions? My partner doesn't have a traditional dairy allergy where here

Since you know a lot about this, can you tell me about diary allergies that cause skin reactions? My partner doesn't have a traditional dairy allergy where here bowels go haywire. She does sometimes feel worse though. The most frustrating symptom for her however is that it always gives her acne. I could find very little to know scholarly articles for this type of allergic reaction.