I have been observing changes in my both thumb nails and foot big toe nails. All the four nails started to show a horizontal line with a dent in middle of the nail. First There is dent in Left leg big toe nail and it started for right left big toe nail as well. Now both my hand thumb nails started to show the same. I have very slight change in left my leg colour compared to right leg. Also there is a pulling sensation in both my big toe nails. Is it related to any liver problems? Should I concern about these changes or is it because of stress factor ? Kindly please provide your suggestions. Thanks