What Causes Soreness In Nose?

I have been experiencing constant soreness in the tip of my nose. It is raw and red and sore to touch especially on the one side. I work as a hairstylist so I am around colour 5 days a week for 9 to 10 hours a day. I'm wondering if this is the cause as if I am not working for about 4 days the symptoms pass. I am wondering if there is any permanent damage that can be done to my nose and is the exposure to colour the cause?