If your LO has eczema what kind of soap do you use for bathing?

LO had a rash on the back of her legs for a few months. We finally took her in this morning and DR said it's eczema. He prescribed a steroid (!!!) cream and suggested we started using Ivory Sensitive Soap. I'm afraid that will dry out her skin though?

He also said thoroughly drying her is very important.

Any other tips?