This is Dr Basu, Experienced Specialist.
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I am different expert.
Jock itch is caused by the fungal infection.
Heat and sweat make it mroe likely.
You should use Clotrimazole
( Lotrimin AF) twice daily for 7 days.
Along with clotrimazole you need to use Hydrocortisone cream as well to reduce inflammation and better penetration of clotrimazole.
Hydrocortisone should be applied twice daily as well.
Your wife also shoudl try same treatment clotrimazole and hydrocortisone twice daily for 7 days.
If the symptoms do not completely go away by that period, then you both will need stronger antifungal ketoconazole
and potent steroid desonide cream which are available by prescription only.
Thank you for sharing your concerns with us today. If you have any additional questions or need further clarifications, please do not hesitate to ask. I am here to answer them. I wish you good health. Regards, ***** *****