There are indeed many skin diseases (approximately 10.000, or even more) and there is no such doctor on earth that can know all of them. But it is a fact that very often we can’t cure the disease because we don’t know the cause for the same. As already mentioned, the first thing the patient should do is drinking the special kidney tea (10 grams of Urtica dioica (nettle), 15 grams of Equisetum arvense, 6 grams of St. John’s wort, and 8 grams of knotgrass) for 3 weeks, as well as the sage tea (which, by the way, should be drunk during the entire life).