Worse diaper rash and Diarrhea

Good evening mummies, I need help urgent from you guys if you dont mind. I attached four images below to let you guys see and advices me. Im a first time mum with twins who is 6+ month old. One of my twin, my daughter has diaper rash mild one, on top of that, every hour she pooping. Her poop is a bit everytime she poop. I will say she has diarrhea. With her ongoing diarrhea, its just make her diaper rash bad to worsen everyday just like the images i attached. Everytime she pee or poop, she will cry like crazy. Its hust broke me to see her like this. I bought desitin in purple, should i put that cream and cover all the wound? And how should I get rid her diaper rash? Now my another twin who is my son too have diarrhea same scenario as my daughter. Please mummies kindly advices. #1stimemom #advicepls #firstbaby