It's caused by dryness and allergies, most likely. I have had the same thing off and on most of my life. Whatever you do, don't let someone talk you into putting petroleum products in there for lubrication -- they block the pores and make it worse. You might try some unpetroleum jelly (sold in health food stores) or some aloe gel, just a little on a Q-tip, and see if it helps.
Try some saline drops to ease the dryness. They're harmless and sold over the counter with cold remedies.
Paxil is absolutely correct about the use of petroleum products.....as he said, they will do nothing except make the problem worse.
Personally I would recommend the use of a Neti Pot. It uses a very mild saline solution and irrigates not only your nose, but your sinuses as well.
recently i was undergone CT scan and found that i was suffering from juvenile nasopharyngeal angiofibroma in my left nose(posterior nasal cavity,the mass extended from formen of sphenoid to pterigopalatine fossa and nasopharynx).one month ago i was operated by the ENT HOD of our medical college by lateral anatomy ,but i still fear that it may be recurrent .there is a thick scar mark after the operation extending from the left corner of my left eye to bottom of my left nostril and thats why i want to have nosesurgery(plasticsurgery),will it be succesfull?