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Can dried shampoo cause pimples on one's face?

It just occurred to me recently that the parts of my face developing pimples are the same parts that I end up inadvertently shampooing in my shower ? up near the hairline, around the temples, and the back of my neck. Could this be the result of my accidentally leaving some shampoo residue behind?
First let me say a little about what scientists believe causes acne and then I'll explain why they might showing up where you are describing and how to prevent their future formation. Scientists believe that there are four major factors that lead to acne: 1) increased production of a protein on the skin called keratin which leads plugging of follicles and the creation of "pimples;" 2) increased production of an oily substance called sebum that helps to plug the follicles; 3) breakage of the pimples which causes inflammation of the skin; 4) and finally a bacteria called p. acnes that lives on the skin and helps to worsen the inflammation. A pimple is one form of acne and called a comedo. It is the result of the plugged follicle containing the excess keratin and sebum. Acne will form only in places with well-developed sebaceous glands such as the face, neck, chest, and back. The distribution of acne that you are describing is likely simply related to where the most glands are. And so it is not likely that dried shampoo is the cause, though it may make things slightly worse by plugging follicles; it is much more likely pure anatomy. Nevertheless, oily hair can contribute to acne and make it worse by plugging follicles and so the type of shampoo you use may make things worse. You should avoid oily products for both your hair and your face, including shampoos that leave an oily residue. Your primary care provider or a dermatologist can better evaluate your symptoms and discuss the further treatment options for you.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under Zocdoc’s Terms of Service.

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