I have got a pigmented line in my fourth toenail. It started as a freckle that was tan in color quite quickly over in four or five months it has turned darker. It is not growing out but spreading in width. The bottom left part of my skin and cuticle area is very itchy at times and it feels tender in my toe and top of foot at times too. I have not had any trauma to my foot, knocked it or dropped anything on it. Is it something that will just disappear? I am a 31 year old female, currently on Amitriptyline 50 mg at night.