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Excessive oiliness is caused by:

  1. Clogged pores

  2. Dehydrated skin

  3. Overactive sebaceous glands

  4. Underactive sebaceous glands

The correct answer is: Clogged pores

Some people may think that excessive oiliness is caused by dehydrated skin since a dehydrated skin lacks moisture which can result in increased oil production. However, this is incorrect as dehydrated skin often overcompensates for the lack of moisture by producing even more oil, resulting in a greasy appearance. Similarly, others may think that underactive sebaceous glands are the cause of excess oiliness, as they produce less sebum (natural oil) than normal. However, the opposite is true. Clogged pores are the main culprit of excess oiliness as they trap sebum, dead skin cells, and other impurities within the pores and lead to an accumulation of oil. This can be caused by using heavy or comedogenic products, not properly removing makeup and dirt from the skin, and not exfoliating regularly. Therefore, the correct answer is A clogged pores.