Poison Ivy. Everywhere in the us and southern canada except the far west, deserts and at high altitude. In the west they have poison oak, which is very similar. Both love roadsides and edges of fields. And certainly into southern canada and northern mexico as well.
Same allergy. Both poison ivy and poison oak. Contain the same allergen which can cause contact dermatitis in susceptible individuals. The reaction and treatment are the same.
Poison oak. No. This tenacious contact dermatitis usually requires prescription strength medications.
Topical cortisol. Over-the-counter Hydrocortisone cream may be sufficient, or your physician may give you a stronger topical glucocorticoid cream such as triamcinolone or a short course of oral glucocorticoids. This must be miserable -- good luck.
Poison ivy. They all all caused by essentially the same oil in the plant and thus they all heal in about the same time.
Difference in leaf. The poison ivy is leaf is composed of three parts on the same level each the shape of an arrow head. See www. Poisoncontrol. Org on their plant section for a picture. If you flatten the sharp edges and make the leaves rounded like a pin oak you have the poison oak. The sumak is a long multipart fron that resembles more of a fern than a regular plant leaf, its small leaflets are similar ti the ivy.
Look for pictires. The plants are different. Poison oak and summac grow like a bush and poison ivy grows as a vine along the ground or up tree trunks. The reactions that people develop to these are the same. The sap of any of the plants in the rhus genus (poison ivy, oak and sumac are common but also mango, cashew and pistacchio) may cause a rash that can itch and blister 12-48 hours after contact.
Where are you? Poison ivy is east coast. Poison oak is west coast.
Look on-line. Plenty of pictures on-line.
What is the diffrence between poison ivy poison oak and poison sumac? Can you be allergic to one and not the other?
Poison ivy. Poison ivy, poison oak and poison sumac are members of the plant genus toxicodendron. Exposure (brushing on clothes and the skin) any of them causes a rash called allergic contact dermatitis. Poison oak is most common west of the rockies, poison ivy to the east, and poison sumac in the southeast.