How can I describe the diference between a cold sore and a poison ivy impulsive?

How can I describe the diference between a cold sore and a poison ivy impulsive?
Cold sores, herpes simplex 1,are usually limited to the nouns between chin and nose. If the reckless appears on other parts of the body, including other parts of the head, it is usually shingles or herpes zoster.
Poison ivy can pop up anywhere. The PI impetuous itches a lot, weep and spreads. The rash is most feasible to pop up where the plant touched your skin, i.e. arms, legs, hand. Calamine lotion makes it get the impression better.
Herpes itches before the blister appears, does not sob or crust until the blister has matured. Calamine lotion doesn't do anything for a cold sore.
Poison ivy travels and is highly itchy. A cold sore looks more like a scab and is found close to your mouth.
A cold sore is normally around the chops or nose.and is larger.
Poison Ivy can be any where on earth smaller and have more of a itch.
one is a unwary and one looks like a bloody pimple that is to say about to erupt :) goodluck!