sore when I wipe

For the last few weeks it's been sore when I wipe my vagina after doing the toilet and it nips. Recently it's gotten worse and it's not only sore after being at the toilet but constantly and it's getting so sore that I hold off going to the toilet for as long as possible. I tried to look and see if there was anything odd but certain parts just looked bit red and inflamed...anybody have any ideas what it could be or any tips on how to help it