Hello. Thanks for using HCM.
From your symptoms, this points more towards what is called a Ganglion cyst
. These are small sac like structures filled with clear gel like content, which evolve in this area of the palm due to tendon or joint irritation due to any mechanical trauma, for example overuse of the joints. These cysts tend to appear and disappear on its own. However once they are persistent, they can be troublesome in doing daily activities, therefore its advisable to get them removed. Its a simple day care surgery and simple procedure. You should consult with your surgeon regarding this and have him take a look at it.
Feel free for further queries.