Hi, From history it seems that you might be having yeast infection on the part. Poor local hygiene aggravates the condition. Clean local part with water and apply anti-fungal lotion regularly. If require go for one oral anti-fungal medicine like Flucanozole 150 mg once in a week for 4 weeks. Keep local hygiene clean, dry and airy particularly during period. Wear cotton inner wears. Ok and take care.