Oolong tea is a traditional Chinese tea. It’s made from the leaves of the Camellia sinensis plant, the same plant used to make green tea and black tea. The distinction is how the tea is processed. Both tea leaves contain several enzymes that cause a chemical reaction called oxidation. Oxidation is what gives the green tea leaves a rich black color.
Green tea is not allowed to oxidize much, but black tea is allowed to oxidize until it becomes black. Oolong tea is right between the two, so it's partly oxidized. This partial oxidation is responsible for the hue and distinctive flavor of oolong tea. However, the color of the leaves can vary between various labels, varying from green to dark brown.
Open Japanese findings indicate that the intake of oolong tea (Camellia sinensis) tends to speed up the removal of recalcitrant atopic dermatitis lesions. 118 research participants continued their normal dermatological therapies but also had oolong tea (10 g steeped in 1000 mL water a day, divided into three doses).
Beneficial outcomes were recorded after one to two weeks, and 74 (63%) of the participants demonstrated a marked to moderate change in lesions after one month. After 6 months, 64 patients (54%) still showed a positive reaction to medication. The thesis draws on animal studies demonstrating that oral administration of green, black or oolong tea has suppressed allergic skin reactions.