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This review discusses the classification and diagnosis of primary scalp alopecia, focusing on scarring and non-scarring types, and reports no new clinical results; it emphasizes simplified diagnostic pathways and tissue processing techniques.

This review evaluates various biopsy protocols for alopecia diagnosis and discusses the authors' experience with the St John's protocol but presents no new clinical findings.

This study found that follicular acantholysis is a common histopathological feature in pemphigus, with differences in depth between pemphigus vulgaris and pemphigus foliaceus lesions that may aid in diagnosis.

This study found that histopathologic features of erythematous papulopustular eruption due to EGFR inhibitors vary with eruption severity and differ between cetuximab and erlotinib treatments.

This case report highlights a rare instance of CD8-positive hypopigmented mycosis fungoides causing alopecia areata-like changes, emphasizing the necessity of scalp biopsy in such presentations.

This report describes two rare cases of desmoplastic melanoma presenting as alopecia neoplastica, highlighting a potential diagnostic pitfall for clinicians examining patients with scar-like alopecia.

This study reports a case of cystic panfolliculoma, highlighting the role of epithelial-mesenchymal interactions in its pathogenesis and explaining its histological resemblance to trichofolliculoma.

This case report describes the histopathological features of nevus psiloliparus in an 11-year-old girl, noting "shadow" follicular units with loosely arranged collagen and reduced elastic fibers.

This study found that the distribution of mast cell prostaglandin d-synthase in the scalp spatially aligns with the pattern of androgenetic alopecia, suggesting a programmed vulnerability to hair loss.

Granulomatous alopecia may be a distinct subtype of alopecia areata.

This study suggests that the epigenetic marker 5-hmC may dynamically influence hair follicle bulge activation during anagen growth in mice, warranting further investigation into its role in stem cell regulation.

This study found that phospho-S6 is strongly expressed in malignant hair follicle tumors but only patchily in a minority of benign tumors, indicating a potential marker for distinguishing between the two.

This case report documents only the second known instance of congenital lymphadenoma, expanding the diagnostic possibilities for cutaneous lymphoepithelial tumors in children.

This letter discusses three plasmacytoid dendritic cell-related parameters that may help differentiate lupus alopecia from lichen planopilaris, but it reports no new study results.

This case report describes a 56-year-old woman whose nonscarring alopecia, consistent with alopecia areata with follicular mucinosis, resolved completely after treatment with oral prednisone.

This case study reported on a 72-year-old woman initially diagnosed with inflammatory alopecia, later identified as having angiosarcoma of the scalp, revealing the importance of considering unexpected malignancies during evaluation of suspected inflammatory alopecia cases.

This article presents a case of spontaneous, recurrent necrotizing infundibular crystalline folliculitis in the inguinal region and suggests unknown etiology possibly linked to microbiome and sebaceous gland dysfunction.

This case report describes an 8 cm giant pilomatricoma on a 67-year-old man's scalp, revealing distinct transcriptional patterns related to hair follicle factors and keratin through spatial gene expression analysis.

This study found that 11% of cutaneous focal mucinosis lesions demonstrated follicular induction, which can mimic basal cell carcinoma histologically and complicate diagnosis.

This study found that polarized light microscopy is more effective than diffractive microscopy in distinguishing scarring from non-scarring alopecia, providing a highly specific adjunct diagnostic tool for alopecia biopsy specimens.

This case report describes the first known instance of alopecia associated with multicentric reticulohistiocytosis, evidenced by scalp biopsy findings of histiocyte infiltration in a 52-year-old woman.

In this case report, a newborn with Conradi-Hünermann-Happle syndrome was diagnosed through early skin biopsy, which revealed unique histopathological features, including dystrophic calcifications, confirming a pathogenic variant in the EBP gene.

In this study of folliculitis decalvans, researchers found that compound follicular structures in scalp biopsies are primarily composed of terminal anagen follicles, surrounded by fibrosis and inflammatory cell infiltrate, which could enhance understanding of this condition.

In this case report, the authors identified that sebaceous gland atrophy, traditionally associated with psoriatic or drug-induced alopecia, can also appear in seborrheic dermatitis, complicating the histopathological evaluation of alopecia biopsies and emphasizing the need to consider seborrheic dermatitis in differential diagnoses.

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.

In this case study, a 69-year-old woman with pityriasis rubra pilaris developed a scarring alopecia with lichen-planopilaris-like features, which responded well to early treatment.

This case report describes an adult female with concurrent mycosis fungoides and papillary dermal elastolysis, highlighting the importance of considering rare presentations in differential diagnoses.

This review of 1360 scalp biopsy specimens revealed that 12.5% of cases involved multifactorial alopecia, highlighting the diagnostic complexity of multiple forms of alopecia present in single biopsies.

This article discusses the role of dermatopathologists in addressing healthcare inequities faced by transgender patients and reports no new clinical findings; it emphasizes the importance of accurate data management to prevent misdiagnosis and insurance issues.