Welcome Tim! I too wondered whether there existed a connection between various skin rashes I've had from time to time and TMS. When I had a herniated disk in my lower left back in 2001 a patch of eczema developed at exactly the same place where the lower lumbar pain was. My family physician assured me that these were two different conditions with presumably two different causes and diagnoses. From what I've learned about TMS, I'd have to call that BS. My batch of eczema disappeared as the pain in my lower back subsided, like the two were very much interrelated and caused by the same underlying emotional condition. Interesting to note that both the lower lumbar pain and eczema developed a short time after my mother's death in January 2001. Interesting to note too that my late mother also had eczema that would flare up as her relationship with my late father went through its various ups and downs. No coincidence I'd say! You'll notice as you read the literature on psychosomatic symptomatology that TMS symptoms are quite often "contagious" from one individual to another by some yet unexplained psychological process. There are preferred and probable symptoms that will be accepted by the medical community.
You're at the beginning of a process of self-discovery and healing. Good luck!