It could be because you were picking at it and it started to bleed and then closed up. It could be because it was infected and is now healing. It's not a terrible thing if the scab is healing well....
If you smoke menthol cigarettes the fiber glass in the filter may be causing dryness in the nose mouth and throat. you may have a sore throat as well as a sore scabbing nose. you nose wont bleed, its...