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2 types:
| • | analogous to focal mucinosis (i.e. not a cyst, but a papular mucinosis) |
| • | differs from focal mucinosis only by its location near the proximal nail fold |
| • | results from an overproduction of hyaluronic acid by fibroblasts |
| • | located on the dorsum of a finger near a DIP |
| • | due to a herniation of the joint lining, thus representing a ganglion |
| • | the hyaluronic acid is derived from the joint fluid of the DIP joint |
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