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Other common signs, not just the well-known immune cells around hair bulbs, are important for diagnosing hair loss from alopecia areata.

This study found that the presence of CD3(+) T-cells within empty follicular fibrous tracts is a reliable indicator for diagnosing diffuse alopecia areata instead of pattern hair loss.

This study found that histopathologic features such as a catagen/telogen shift, melanin in fibrous tracts, and small dystrophic follicles can help differentiate alopecia areata from pattern hair loss in the absence of peribulbar infiltrates.

This case study diagnosed a 60-year-old woman with frontal fibrosing alopecia after histopathological analysis showed characteristic scarring patterns in the hairline area.

Examining scalp tissue under a microscope helps diagnose and understand hair loss diseases.