A non-native ornamental plant "Cestrum diurnum" know as Din-ka-raja or Dinamallika has been in use among some of the traditional Ayurvedic Vaidyas who by trial and error found out that the leaves of the plant are useful in the treatment of Kitibha Kushta. Further review of literature based on the methodology of anuktadravya, the drug has been found suitable for therapeutic use in skin ailments such as Kitibha Kustha (Psoriasis). Keeping in view, the burning problem of Psoriasis in the present era and its associated devastating disease, it has been decided to do research on Kitibha Kustha (Psoriasis) by using the oil prepared with "Cestrum diurnum" externally. As the drug does not have direct reference in Ayurveda to prove its action scientifically, there is a need to conduct appropriate clinical trials to establish the same. Further, as the plant is very easy to cultivate and the useful part being the leaves it is an ideal choice for therapeutic usage. Hence in the present study the drug "Cestrum diurnum" was selected to prove its efficacy clinically in Kitibha Kustha (Psoriasis).