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According to cosmetic dermatologist Michele Green, MD, skin type is the most important factor in determining what skincare products will work best for you. "There are no bad products necessarily, but sometimes people with different skin types use the wrong product for their type of skin," Dr. Green says. You might have guessed it already, but those with acne-prone and sensitive skin need to be the most cautious with different ingredients in their skincare products. To all the oily skin types out there, you're actually the winners here: Oily skin can handle a wider range of ingredients that can sometimes trigger breakouts or irritation to other skin types.