[Skin Concerns] Is there a foolproof way to tell if you have oily or dry skin?

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I can't tell honestly. Sometimes, if I press against my forehead hard/pinch (it's probably bad for the skin to do this), it feels a little greasy, but there's never visible oil. Sometimes, the bottom sides of my nose feel a little dry but oily (like itchy but oil rubs off). There's no visible oil on my face though, I think, until I put lotion on (cerave in the pump), then there's some shine.I have darkish Indian skin, but it's pretty matte (and I have some acne)How can I tell if my face is oily or not?
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Submitted by Hufe