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Your concern may be intertrigo secondary to candidal yeast infection.
I suggest you stop using Terbinafine tablet and try Sporanox (Itraconazole) 100 mg capsule. Have it one daily for four weeks.
Do not change the brand.
Apply Onabet (Sertaconazole Topical) cream twice daily and Onabet powder (Sertaconazole Topical) immediately after applying the cream.
You need to have Teczine (Levocetirizine) 5 mg daily one after dinner.
You need to have twice bath if possible and avoid wet and sweat-inducing activities.
For more information consult a dermatologist online --> https://www.icliniq.com/ask-a-doctor-online/dermatologist