Red, itchy fungal infection in the groin area is commonly due to tinea cruris (jock itch). Fourderm may not help and can sometimes worsen fungal infections because it contains a steroid. Doctors usually recommend plain antifungal creams such as Luliconazole, Terbinafine, or Clotrimazole applied as directed for 2?4 weeks. Keep the area dry, wear loose cotton underwear, change sweaty clothes promptly, and avoid scratching. Please consult a dermatologist if the rash is spreading, painful, recurrent, or not improving within 2 weeks.