A boil water advisory was issued for approximately 1,500 customer connections in the City of Clairton, Pennsylvania, due to a loss of positive water pressure caused by a power outage to a booster pump station, according to newsroom.amwater.com. The loss of pressure created conditions that could allow contamination to enter the distribution system through back-flow by back pressure or back siphonage, according to the same source. The advisory was lifted for the same Allegheny County community, according to WTAE. A boil is a skin infection that starts in a hair follicle or oil gland, commonly caused by the bacteria Staphylococcus aureus, according to WebMD. Boils can appear on the face, neck, armpits, buttocks, thighs, groin, pubic area, and lips and folds of the vagina, according to WebMD and My.ClevelandClinic.org. They usually begin as red, tender, swollen bumps that fill with pus over hours or days, according to My.ClevelandClinic.org and TheWoundPros.com. An abscess is a tender packet of pus shielded by inflamed tissue, and cysts are benign pockets of tissue containing fluid, pus, or other materials, according to TheWoundPros.com.