MY DOGS NOSE GETS DRY AND SCABBY?

MY 4 YEAR OLD FEMALE DOG HAS A SCABBY NOSE,IT NOW LOOKS ALMOST PINK ALMOST ALL THE BLACK ON HER NOSE HAS GONE,SHE GETS WHAT LOOKS LIKE LITTLE BLOOD BLISTERS ON THE EDGE OF HER NOSE THAT BURST AND BLEED,(I AM SORRY I AM NOT SHOUTING ) I DO NOT THINK SHE IS IN ANY PAIN,SHE EATS AND DRINKS WELL,I TRY TO PUT VASELINE ON HER NOSE BUT SHE IS A VERY NERVOUS DOG AND DOES NOT LIKE YOU GOING NEAR HER NOSE OR ANYTHING,AND I DO NOT LIKE FRIGHTENING HER . I DO NT KNOW WHAT TO DO AS THERE IS PART OF ME THINKING IT MUST SURELY HURT :(