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.
Frequent boils may be caused due to this bacteria in their skin and nasal passages. Medical conditions like diabetes too can cause boils on the neck. Clothing can also cause the skin to get irritated, causing boils. Symptoms may include, swollen red skin on the neck area. The boil may be a hard and reddish bump in the initial stages.