How to cure oily skin<br>Use a gentle facial cleanser twice a day. Most dermatologists agree that cleansing the skin is the best way to reduce oil. Make sure to use a gentle, ph balanced cleanser rather than regular soap.
Oily skin isn't common.
If most dermatologists know how to deal with oily skin then it must be common. The system cannot know if it's common or not based on this passage.
( z1 common :polarity - :domain ( z2 skin :mod ( z3 oily ) ) )