Red, itchy patches in the groin for several months are most often due to a persistent fungal infection like Tinea Cruris, which can become difficult to treat if steroid-mixed creams are used or treatment is irregular. Keep the area clean and completely dry, wear loose cotton clothing, and avoid sharing towels or tight garments. Continue a plain antifungal treatment regularly for a few weeks even after the rash looks better, as stopping early can cause recurrence. Since your symptoms have lasted more than 3 months despite treatment, you should consult a doctor for proper evaluation and possibly a longer, supervised treatment plan to ensure a complete cure.