Definitely could be. Not sure what other conditions might do this… dishydrosis covers internal reactions to foods as well as topical exposure to chemicals. I’ll note also that the one finger or one toe thing happened to me at various times, which suggested to me it wasn’t my skin being exposed to an irritant. Sometimes it was the same fingers or toes on both sides of my body, which is a common feature of autoimmune skin conditions.
It sounds like everything is working, so… whats the issue?