How is contact HS?

The most common substances that cause contact dermatitis include: – Poison ivy, Poison oak – Nickel, and – Fragrances What is urushiol? ➢ Urushiol is an irritating, oily sap found in all parts of poison ivy, poison oak, and poison sumac plants, including the leaves, stems, and roots. ➢ It's even there after the plant has died. ➢ Urushiol is absorbed quickly into the skin. Poison Ivy: ➢ The rash produced by contact with poison ivy is caused by a T-cell response to a chemical in the poison ivy leaf called pentadecacatechol. ➢ This compound is lipid-soluble and can therefore cross the cell membrane and modify intracellular proteins