A person had habit of walking continuously. Due to continuously walking the bottom skin of his leg became hard in an area of 1 sqcm. He ignored it. Consequently the hard skin spreaded internally.
Now he felt as if a traingular stone is embedded in his leg while walking. It was intolerable. He tried to pull hard skin by his fingers but it was connected with alive soft skin and muscle cells. And it pained.
Now only remedy was a surgery. That means one month bad rest after surgery. Obviously while removing dead cells from skin, the soft cells were likely to get damaged and so he could not walk for at least a month.
More worse, it could happen that he may not walk properly for rest of his life, if while doing surgery the soft parts are damaged. Being the most used part of body and whole body standing on leg, this was possible.
An old village man saw this. He said, no need to do surgery. I will cure in 24 hours without surgery. He got some white milk of Dhatura leaves. This is also known as white poison as this leaves are poisonous. He warned the patient not to apply anywhere on skin as it is dangerous and is a poison. He carefully applied this white milk or white poison on the hard skin cells. Within 24-48 hours the hard skin triangle got as soft as cotton. At end of 48 hours, the patient removed the hard skinned triangle or prism from his leg leaving a prism shaped hole is his leg. There was no pain. And he could walk immediately!!!. Because no alive or soft skin cells were harmed!!!
It is said that modern medical science got 80 percent of its medicine from its ancestors. And medicines over few deadly diseases were gained from the red Indians and other wild castes either by bribing or by threat as they used to keep a lot of medicines hidden .
I got convinced that it's just not Africa or the Africans who know about medicines over incurable diseases, but even many old aged people, living in Indian villages, are aware of such medicines which is still a secret for the modern medical society.