Yes, first of all it is really necessary to know that whether it is a wet rash or dry rash. When the symptoms are known properly , then the solution can not be provided properly. So, kindly provide the answer to this question that whether it is a wet rash or dry rash. Then, you will get all solutions to your problem.
Could it be a heat rash? Cord Care powder works really well for heat rashes/rubbed raw rashes! If not I would say use plantain vodka on it to kill bacteria and apply comphrey or coconut oil to it.