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Cuts and swollen skin occurs when it becomes irritated by the friction caused by rubbing against other skin or against a foreign material.If there is any change in the color or odor of vaginal discharge then a vaginal infection can be suspected.
Apart from that warts can also cause these symptoms and might be possible that it has flared up now.It is difficult to comment without a clinical examination.
Some suggestions:
1)You can apply some calamine lotion at the rash as it will help in soothing the skin.
2)Application of a topical antibiotic cream like Bactroban or Neosporin and oral antiinflammatories after a prescription from your doctor are helpful in reduction of the redness and inflammation.
3)Wear loose cotton undies and avoid tight fitting clothes.
If the symptoms worsen consider visiting a Gynaecologist for evaluation.
Take care!