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The article underscores the critical role of histopathological evaluation via scalp biopsies in diagnosing scalp disorders, particularly in differentiating between cicatricial and non-cicatricial alopecias. It stresses the importance for medical residents to grasp normal hair structures and biopsy techniques for accurate interpretation. The review covers various biopsy techniques, such as horizontal and vertical sectioning, and their pros and cons, emphasizing the importance of selecting the correct biopsy site, especially in scarring alopecia, with trichoscopy aiding this decision. It also details the histological features of different alopecias and the necessity of clinicopathological correlation, particularly in cicatricial alopecias, due to overlapping features.

The document presented various case reports on hair disorders, highlighting the complexity and variety of these conditions. Notable cases included a 53-year-old female with alopecia totalis and multiple systemic issues, a 24-year-old male with cicatricial alopecia due to lichen sclerosus et atrophicans, and a case of short anagen hair syndrome linked to a ventricular septal defect. Trichodynia associated with female pattern hair loss was treated successfully with spironolactone. Other cases involved pili torti with mental retardation, alopecia areata with lichen sclerosus et atrophicus, and a positive response to methotrexate in lichen planopilaris. Woolly hair syndrome was diagnosed using trichoscopy, and a rare case of eruptive vellus hair cysts was described. These reports underscored the diverse manifestations and potential treatments for hair disorders.