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.
1 The boil does not drain. 2  A second boil appears. 3  You have a heart murmur, diabetes, any problem with your immune system, or are taking medications that suppress the immune system (for example, corticosteroids or chemotherapy for cancer) and you develop a boil.  Boils usually do not require emergency attention.