Since you’re saying there is no rash and just itching, I would need to know more, about general hygiene, sharing of towels/napkins and general living conditions. It could be fungal like you rightly pointed out and started on candid powder. But it could also be something like scabies which comes in bouts, especially at night and in the morning. The treatment for both would be completely different.
You can visit my clinic and I would be able to help you better.
Next Steps
To confirm, examination of the itchy areas is necessary to confirm the diagnosis and start treatment
Health Tips
Please show it to a general practitioner or dermatologist