Several types of lice, bacteria, and fungi can invade the scalp and cause numerous problems. These infectious agents of the scalp and other regions of hair are collectively called "dermatophytes". Different dermatophytes are common in different parts of the world and at different times in history. The same clinical diagnosis today may be caused by something very different than the same clinical diagnosis fifty years ago. For example the most common cause of tinea capitis in Europe and the USA in 1955 was Microsporum audouini... (Read More)