I have horizontal waves on both thumbnails and dry, sometimes scaly skin, especially on my shoulders and scalp. Also, the cuticles around my thumbnails are always dry and cracked. I am 53, 5'10", 143-lbs. and in otherwise excellent health (at least so far as I know). I take no prescription meds and am an avid runner and lift weights 2-3 days per week. What do you think and could these conditions be related? Thanks.