Hi. I have small sores on my arms that will not heal. They started out as scratches from my cat when we were playing. I picked at the scabs, they bled, crusted over, but will not go away. They are dark colored with white centers and slightly raised. I have used a variety of healing salves on them. They do itch and bleed at times. I also have one on my thigh too. It was a small lesion like a mosquito bite that I scratched at. Should I be making an appointment with a dermatologist?