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Looks like tinea cruris (Jock’s Itch) - Amphotericin B cream ?
I think it is Fungal infection
But no benefit of any antifungal agent on it
Anti-fungal cream. wash area daily with soap and water. When clear apply powder daily
Tinea cruris(jock itch) Anti fungal drug needed
Hair is also infected in case of recurrence.
Tinea cruris, if not resolved, rule out mycosis fungoides
Fungal. Give nystatin powder tid