Abstract
The diagnosis of alopecia can be challenging, usually the doctor needs clinicopathological correlation to achieve the correct diagnosis. Sometimes, more than one hair disease can coexist, making accurate diagnosis even more difficult. The alopecias are divided by scarring and nonscarring alopecias, by dermoscopy or histopathology issues. This basic differentiation is important to understanding why some alopecia can improve after treatment and others not. It is crucial to remember that there are alopecias caused by infections problems or inflammatory scalp diseases, such as fungus infections and psoriasis, for example.