Toxicodendron radicans, commonly known as eastern poison ivy or poison ivy, is a poisonous Asian and North American flowering plant that is well known for causing an itching, irritating, and sometimes painful rash in most people who touch it, caused by urushiol, a clear liquid compound in the plant's sap.
Boil: Introduction. A boil is a large infection of a hair follicle, the tiny opening in the skin from which a hair grows. Boils are due to an invasion of bacteria that enter the follicle and cause a bacterial infection of the follicle and nearby skin. Boils are also called skin abscesses or furuncles.
Boils (furuncles) can develop anywhere on your skin, but they're most likely to occur at the site of an infected hair follicle (a hole a hair grows out of). Boils most commonly develop on areas of skin where there's a combination of hair, sweat and friction, such as the neck, face or thighs.