52%. Source: The Rochester, WA weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.
A pilonidal cyst is a fluid-filled sac that occurs in the area at the top of the crease of the buttocks overlying the tailbone (sacrum). This cyst and the overlying skin in the area can become infected, forming a painful abscess. Pilonidal cysts are fluid-filled sacs that form at the top of the crease of the buttocks above the sacrum. 2  A painful abscess can form if the cyst and the overlying skin become infected.
Pilonidal' means a nest of hairs. A pilonidal sinus is a sinus that contains a tuft of hairs. These sinuses are commonly found in the skin covering the sacrum and coccyx but can occur between the fingers, particularly in barbers, and at the umbilicus. A pilonidal sinus is not lined by skin and there are no hairs growing within it.