Also known as the contact dermatitis, it is the inflammation of the skin caused by direct contact of the skin with the sap of the Oak tree. The sap contains irritant or allergen. The irritant type of condition resembles a lesion caused by burning. Being the most common type of inflammation it includes inflammation which results from contact with acids, alkaline materials or chemicals. On the other hand the allergic type is caused by exposure to substance or material you are already allergic to. Treatment of the dermatitis may be done by use of ointments with washing of infected place with lots of water.