Ibn Qayyim in "Medicine of the Prophet" said, "The most beneficial simple kinds of grease are regular oil, then fat and then sesame oil. As for the compound greases, some kinds are wet and cold, such as the essence of violet, which helps against hot headaches and brings sleep to the eye. It moisturises the brain, helps against cracks (or fractures) and excessive dryness of the skin. It is also a beneficial ointment against mange and dry rashes, along with helping the joints be flexible. It is suitable for those who tend to be hot during the summer.”