It is the inflammation of skin which is caused when your skin comes in contact with the oil(sap) of the sumac plant. The sap is present in all parts of the plants including the leaves, stems, flowers and roots, which can easily come in contact to anyone. Itchy skin, red lines and bumps filled with fluid that may leak out are the general symptoms. All the symptoms of poison oak, ivy and sumac are same, and treatment of the respective infections so caused is also the same. They are the most common type of skin problems associated with plants.