This is most likely NOT a fungal infection (since proper antifungal treatment has already failed).
• Most likely diagnosis:
• Lichen simplex chronicus (itch–scratch cycle)
• Pruritus ani (chronic anal itching)
• Possible irritant/contact dermatitis (sweat, friction, soaps)
Why this fits your case:
• No ring-shaped rash → fungal less likely
• Long duration + no response to antifungals
• Skin darkening → due to chronic scratching
• Worse at night → classic itch cycle / pruritus ani
Next Steps
• Wear loose cotton underwear
• Change underwear twice daily if sweating
• Avoid tight clothes / gym wear for long hours
• No harsh soaps, dettol, or antiseptics
• Do NOT scratch → worsens pigmentation + itch
Kindly consult with me via Practo for detailed evaluation and treatment