Pulling sensation in Left leg Toe nails.

From last 4 months I have been observing my left leg Big Toe nail texture Changing and also there is bump happened in middle of the nail, there is lot of pulling sensation in my Toe fingernail. And also left leg colour is slightly ch aged compared right leg. Is this is related to any health complication? I have recently got my blood test and Liver tests done. I'm having Vitamin B12 Deficiency and my liver tests are normal. Is my leg colour change due to peripheral artery disease (lack of blood flow) how do I make sure it is not something serious ? Which doctor should I consult? Recently consulted an Orthopaedic, he said there is slight leg colour variation is there but is it not related to any clots in my leg. Should I consult a Dermatologist?