Long-standing and recurrent infection, like Tinea Cruris, usually means the fungus is not fully cleared and may be worsened by steroid-mixed creams like Canesten-S. The correct approach is to avoid steroid combinations, use a plain antifungal treatment regularly for 3-4 weeks and continue for at least 1-2 weeks after the skin looks normal, and strictly maintain hygiene by keeping the area clean, dry, and sweat-free, wearing loose cotton clothes, and not sharing towels. In many chronic cases, doctors may also advise a longer supervised course of oral antifungal medicines. Since your infection relapses quickly, it is important to consult a doctor (even online) for a proper long-term plan to ensure a complete cure and prevent recurrence.