Stubborn forehead texture- HELP

I don’t think this is fungal acne because it isn’t itchy at all. My routine is very simple: I use Aveeno Oat Serum and Cetaphil Hydrating Moisturiser. When I was on holiday, my skin was completely clear — zero texture, smooth, balanced, perfect. As soon as I came back home, this forehead texture returned. I don’t understand why this keeps happening. I never used to have an oily forehead, but now it gets oily very quickly, while the rest of my face feels super dry. My skin is sensitive, so I’m hesitant to start using strong actives. Exfoliation doesn’t seem to suit my skin either — every time I’ve tried AHA, BHA, or salicylic acid, it just irritates my skin and makes things worse. Has anyone experienced something similar where their skin is fine in one environment but congested in another? Could this be climate, water, stress, or something else? Any advice would be really appreciated.