Does over-washing make skin oilier?
It's a popular idea that stripping oil makes skin "overproduce" to make up for it. There's little good evidence for it. What harsh washing does do is irritate and dry the skin, so it can feel tight and look oily at the same time. A gentle cleanser twice a day is enough.
If oiliness arrives suddenly with other changes, such as new acne, irregular periods or unwanted hair growth, it's worth seeing a doctor, as these can point to a hormonal cause.