Eczema or rash??

My baby has always had a few small patches of dry skin on her face but I put lotion on them and it goes away. Yesterday I noticed a dry patch if skin all across the side of her forehead so I put lotion on that hoping it would get better. This morning I checked to see if it had cleared up but it was red and still dry. I brought it up to her doctor and he said Vaseline would be fine. I tried that and it still isn't working. Could it be eczema or some type of rash?