That part of the wrist is often a site for cysts. They are called ganglion cysts and may contain fluid around tendons as well.
http://en.wikipedia.org/wiki/Ganglion_cyst
Also associated with tendons are neuromas (this is genetic as a rule), but those tend to have pain associated with them).
And lipomas may occur around tendons too.
http://www.hmc.psu.edu/healthinfo/jkl/lipoma.htm
Another thing that happens in the wrist and ankles is tissue swelling which can compress the carpal tunnel, due to hypothyroidism. (Low thyroid).
If your swelling causes pain or restriction of movement of your hand, I'd see a hand specialist. But most cysts of the wrist do not.
__________________
All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
************************************
.
Weezie looking at petunias 8.25.2017
****************************
These forums are for mutual support and information sharing only. The forums are not a substitute for medical advice, diagnosis or treatment provided by a qualified health care provider. Always consult your doctor before trying anything you read here.