How long your poison ivy rash will last depends on the severity of exposure as well as whether you've had a rash in the past, ...

You can treat the uncomfortable symptoms of a poison sumac rash by using anti-itch creams, taking an oatmeal bath, and applying a cool compress.

Commenters identified the plant as Persicaria longiseta, commonly known as smartweed and lady's thumb. Persicaria longiseta ...