Mucous cyst https://en.wikipedia.org/wiki/Mucocele
Mucous cyst o fa'ama'i galioni o mata'itusi, e masani lava ona i ai i so'oga fa'alatalata mamao.

Fa'amatalaga atili ― Samoan
References Digital Mucous Cyst 32644518 
NIH
Digital mucous cysts o se ituaiga kegiona e masani ona vaaia i le lima. kegiona (ganglion) o se tuma o le tino vaivai e maua i tafatafa o se sooga poʻo se tendon. kegiona mucocele (digital mucous cyst) fa'apitoa e atia'e mai le pito i tua o le so'otaga va'ava'ai mamao (DIP joint). O nei kegiona (cysts) e masani ona i ai i le osteoarthritis o le DIP sooga fa'avae.
Digital mucous cysts are a type of ganglion commonly found on the hand. A ganglion is a soft tissue tumor that is found next to a joint or tendon. A digital mucous cyst is a ganglion that arises from the dorsum of the distal interphalangeal joint (DIP joint). Digital mucous cysts commonly have an association with underlying DIP joint osteoarthritis.