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Itching, scratching and dryness form a visicious circle. So try to avoid scratching , keep nails trimmed, wear cotton panties, and apply Calendula
ointment/gel (will reduce irritation and heal the cut).
Drink plenty of fluids, try not to hold urine. Wash yourself (front to back) each time you urinate.
Also please get your blood sugar levels checked.
If the problem is recurrent, you can consult a homoeopathic physician .