Severe itching and worsening rash around the vaginal area are usually due to a fungal infection like Tinea Cruris or Vaginal Candidiasis. Use a plain antifungal cream such as clotrimazole or luliconazole twice daily for 2-3 weeks, keep the area clean and dry, and wear loose cotton underwear. Avoid steroid-mixed creams, as they can worsen the infection. If symptoms are severe or not improving, a doctor may prescribe an oral antifungal like Fluconazole. If it still persists, consider an online consultation for proper diagnosis and treatment.