Seems you have to know what cause the skin rashes first. Better see the doctor first.
For me, my bb girl has wind and the doctor suggested "omneo", it has easy to digest "hydrolysed protein" and no latose. You can only get it from Mannings. It's from the producer of "cow & gate" bb formula. But as I said, you better visit the doctor first. Sometimes, rashes are not caused by milk formula.