Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. It seems that most probably you may be having perianal dermatitis and vulvovaginitis. Consult the dermatologist for the perfect diagnosis and proper treatment. Irritation due to soap,vaginal secretions,urine and fecal debris may be responsible factors for the disease. Candidal infection may be also probable cause. Blood tests are needed to rule out internal diseases like anemia, diabetes and immunodeficiency diseases. Keep the area dry and hygienic and Sitz bath may be done in Dettol mixed water. Take steps to improve immunity. Apply antibiotic and anti fungal mixed cream on the affected areas. Take a course of antibiotic and antifungal tablets under observation of doctor. Antihistaminics may be taken to relieve itchy sensation. Hope I have answered your query. Let me know if I can assist you further.