Dry skin or just dehydrated?

I often meet ladies with a bad breakout but they complain that their skin is very dry. When I skin type them as oily skin they are very surprised. I would like to make one thing clear. The skin may feel dry of two reasons. Could be the lack of water or lack of oil. In first case you may have an oily skin but it feels dry because your skin is dehydrated. So, your skin needs a water based oil free moisturizer. Your skin will feel comfortable and you won't breakout. Second case is when you don't have enough oil into your skin. Your skin is very tide all over. You need to use a rich moisturizer.