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Medicines in the form of a paste used for external application are called '''Avaleha''Lepas' or '''Lehya''' is a semi-solid preparation of drugs, prepared with addition of jaggery, sugar or sugar-candy and boiled with prescribed juices or decoction.

==Preparation InvolvesMethod of preparation==*They usually consist of solutions or dispersions of one or more medicaments in suitable bases.*The base should not produce irritation or sensitization of the skin, nor should it retard wound healing; it should be smooth, inert, odourless, physically and chemically stable and compatible with the skin and with incorporated medicaments.<ref name="AYURVEDIC PHARMACOPOEIA OF INDIA"/> ==Characteristics==*The proportions of the base ingredients should be such that the ointment is not too soft or too hard for convenient use. The consistency should be such that the ointment spreads and softens when stress is applied. ==Preservation==*Lepa retains thair potency for 3 years, if kept in air tight container.<ref name="The Ayurvedic formulary of India"/>

<ref name="AYURVEDIC PHARMACOPOEIA OF INDIA">THE AYURVEDIC PHARMACOPOEIA OF INDIA, PART-II, VOLUME-1, page no 129113.</ref>