a couple simple things come to mind from my past experiences, have you changed soaps? it might be the begining of a urinary tract infection, that makes the clit quite painful and requires an antibiotic.. trauma can also cause this as well as infection or an std.. but i would start simple and see if its a urinary track infection, definatly go see an obgyn
are u sexually active? that could be a reason for you'r symptoms or you could be getting a yeast infection also a urinary tract infection the best thing is to see a doctor to get it takin care of right away.
It could be any type of soaps or body washes you are using that could be irritating you down there, and if you are sexually active and that part of your body is being stimulated often, especially if it is dry, could cause irritation as well. Use plenty of lubrication when you are sexually active and try to stay away from using soaps down there. I used feminine wipes you can get at the store that will make you feel and smell cleaner down there. Also, if the problem persists, see your doctor cause it could be an infection or a sign of an STD. Hope this helps.
may be due to damage in dorsal nerve....... consult gyno soon...