Extremely dry face?

I use to have really oily skin and I had started to use face washes and thigs to get rid of all the oil, which it did. For about a month my face was just right not to oily not to dry. Well lately my face has become extremely dry, I've got tiny bumps all over my face (not acne) and little red splotches all over my face. How do I get my face to not be so dry? And what are these bumps called?
Extremely dry face?
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