Welcome and thanks for posting your query to HCM.
It appears from your problem that you are suffering from "fungal infection" of the area with infection over the crural fold.
This is a common condition resulting from the hot humid climate which favors the growth of fungus over the thigh area. This area is always covered so results in more of worsening of the situation.
Kindly do not scratch the areas can lead to more worsening of the situation.
For the betterment you do warm water compresses over the affected area.
Wear Cotton clothes and cotton undergarments. Change your undergarments twice daily. Stay away from the hot and humid climate.
You can continue with the ointment given by the doctor along with the measures provided above to get early relief.
If the things are worsening despite aboe measures then you need to meet a dermatologist
to get relief from this condition.
Hope these informations are helpful.
"Wish you good health"
Dr Sanjay Kumar Kanodia
MD (Dermatology & STDs)