Whats difference between ganglion cyst and neuroma? how are they treated if not causing a problem?

Different: A neuroma is a tumor made of nerve and scar tissue. A ganglion cyst is an exvagination of a joint capsule, usually the dorsal joint capsule of the wrist. Either one can cause pain, and either can be excised surgically. The classic treatment for a ganglion cyst is to drop a very heavy book on it, rupturing the cyst, leading to its classic name "bible cyst". No joke.

Ganglion is a joint : Fluid- filled cavity that are often painless or mildly tender+or- unsightly & easily seen thru skin. Neuroma is an exquisitely tender bulbous zone in a nerve that causes electric shock-type sensation when tapped and can't be seen except at surgery.

Very different: One is a gelatinous filled cyst, the other an inflammed nerve. If no pain can leave both alone.