Should we go back to the doctor?

My so has this rash near his groin.. We went to the doctor and she said it looks like Jock Itch.. We've been putting ointment on it today.. We just noticed that it's spreading to his butt like around his butthole, and it's spreading to the other leg.. 
He also has told me that since we've been putting the ointment on it burns, and it's been itching more then it already did.. 
I'm super worried since it's around his groin. I don't want to make him upset or anything but I am really worried about it..

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