Poison Ivy, Sumac & Oak
Poison ivy, oak and sumac are the greatest cause of allergic reactions within the US. Between 10 and 50 million Americans each year develop an allergic rash after contact.
Oftentimes the rash appears in a straight line, usually mimicking the way the plant brushes against your skin.
Some poison ivy, oak and sumac rashes can be treated at home with soothing lotions and cool baths. However, if your condition worsens or becomes severe, you may need prescription medication, especially if the rash spreads to your face or genitals.