Hello and welcome to HCM,
Thank you for your query.
In such cases the option would be to take a tissue sample from the site of the infection/rash
. Sending this to the laboratory can help in identifying the organism causing this infection.
And this information would help in combating the organism better.
In the mean time try to avoid keeping the area wet, and wear comfortable clothes.
I hope I have succeeded in answering your questions, you could write back to us anytime for further clarifications.