Rash issues

So I've been using the same stuff since day 1 when my daughter gets a diaper rash and she spent a day with her grandma and got lathered in a lotion i dont use which doesnt bother me but since then she had a rash on arms and legs and now she pulls so hard on her diaper its causing a diaper rash that's bleeding and the desatin that's light blue is what I normally use I learned the purple tube makes her break out also then I also sometimes use petroleum jelly as she has very acidic poops when she eats certain foods and now that she feels the pain of it she stopped pulled and all but this rash is persistently wanting to stay so what has anyone else tried when this kinda thing comes on!?!?!