Some of those dermatophytes are so tough and resistant to local treatment with over-the-counter anti-fungal ointment or cream to the localised skin infection over a prolonged period of 6 months, that prescribed medicine must be used to systematically inhibit their growth, and cure the skin. Those fungal infections are related to "athelet' foot" and "Jockey's itch".
Those dermatophytous fungi belongs to the genera Microsporium, Epidermophyton, and Tricophyton.
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