Charak Samhita
पलाशनिर्दाहरसेन चापि कर्षोद्धृतान्याढकसम्मितेन। दर्वीप्रलेपं प्रवदन्ति लेपमेतं परं कुष्ठनिसूदनाय ॥१६॥
and palashanirdaharasa (juice of palasha that is obtained from burning the roots), when reduced to a semi-solid state (darvipralepa), makes the best lepa for kushtha.
english translation
palAzanirdAharasena cApi karSoddhRtAnyADhakasammitena। darvIpralepaM pravadanti lepametaM paraM kuSThanisUdanAya ॥16॥
hk transliteration by Sanscript