Differential Diagnosis of Scalp Hair Folliculitis

The document discussed scalp hair folliculitis, a common dermatological condition that posed diagnostic and therapeutic challenges due to the absence of precise guidelines. It highlighted that folliculitis could be caused by various infectious agents like bacteria, viruses, and fungi, as well as noninfectious factors. Noninfectious diseases such as folliculitis decalvans capillitii and lichen planopilaris could also present as folliculitis. The classification of folliculitis was noted to be confusing and controversial, with three main groups identified: infectious folliculitis, noninfectious folliculitis, and perifolliculitis. The diagnosis often required histologic confirmation beyond clinical examination. The article aimed to summarize the prominent variants of inflammatory diseases affecting the scalp hair follicle, along with their differential diagnosis and histological features.