When my arms were really bad due to the RSI - I was wearing my arm /wrist wraps, or my DeQuervains thumb wrap, or my Cubital tunnel elbow compression straps- cripes what abunch of contraptions ! now that I add them up .
I would just say something like "I have arm problems" or later as it spred "I have arm & shoulder problems".
Of course it isn't the same thing and most people didn't stare much - at least I didn't notice

.
What are some good and simple things to say in those times?
Maybe a " I have a chronic pain condition, called RSD"