my 2 cents, having read the comments thus far: after menopause (not sure about changes of andropause in men), many things change in our skin. In my arms, the crepey skin is most obvious. I suspect it's not related to Hashimotos, although I too have Hashimotos and frequently have wrinkly fingers--probably more commonly wrinkly than not! My thyroid levels have been inconsistent since I've been seeing a new endocrinologist for osteoporosis, who wanted to bring my T3 down (in case it was worsening my bones), and the wrinkling of my fingers and fingertips is consistent. I hydrate, I excercise, and I stay warm. If I could guess one consistent time that my fingers AREN'T wrinkly, it's when I'm hot from exercise.