Cyst yn sach gaeedig. gall cyst gynnwys aer, hylifau, neu ddeunydd lled-solet. Gelwir casgliad o grawn yn abscess, nad yw'n cyst. Efallai y bydd angen tynnu'r cyst trwy lawdriniaeth, ond byddai hynny'n dibynnu ar ei fath a'i leoliad.
A cyst is a closed sac, having a distinct envelope and division compared with the nearby tissue. Hence, it is a cluster of cells that has grouped together to form a sac (like the manner in which water molecules group together to form a bubble); however, the distinguishing aspect of a cyst is that the cells forming the "shell" of such a sac are distinctly abnormal (in both appearance and behaviour) when compared with all surrounding cells for that given location. A cyst may contain air, fluids, or semi-solid material. A collection of pus is called an abscess, not a cyst. Once formed, a cyst may resolve on its own. When a cyst fails to resolve, it may need to be removed surgically, but that would depend upon its type and location.
Ganglion cyst ― Lympiau asymptomatig sy'n digwydd yn sydyn rhwng cymalau. Os cadarnheir y diagnosis o goden ganglion, gellir datrys y broblem trwy wasgu'r nodule yn galed i fyrstio'r goden y tu mewn.
Mucocele ― Mae'n ymddangos fel lwmp meddal ar y gwefusau heb unrhyw symptomau.
