Thanks for the query.
This appears like a fungal infection
What all medication you have applied can give relief just for a few days.
Here is my advice for you.
1. Apply oint clotrimazole
in night and clotrimazole powder in day for atleast one month. Remember to use it for one month even if the itch stops, this will prevent recurrence.
2. Take an anti histamine
3. Dont share your towel or cloth with anyone, this can spread the disease. Also it can spread sexually. So better to avoid sexual intercourse for atleast 10 days, with regular medication.
Dont worry it is completly curable.