My baby 5 month old she having backside fully small small bumps like small balls in starting now it's disappear fully but now her skin not smooth it's like very rough we can't use any lotion to her

A. Use Regularly on to that area which is what is going to help in making the skin even and soft I think the rashes may have appeared appeared due to the small pimples over there previously that you are talking about to use Cetaphil lotion regularly