Follicular Pattern in Hailey Hailey Disease
In this one patient, correlating lesion morphology and distribution with biopsy findings supported Hailey-Hailey disease despite an atypical papular and follicular presentation that overlapped clinically with several other dermatoses.
> Research explainer: This briefing examines verified primary research published 57 days before the briefing date. It is not a same-day research update and does not provide medical advice.
Evidence
This research explainer examines one published case report of a 38-year-old man with recurrent pruritic lesions in flexural and intertriginous skin. He also described occasional burning. The report states that heat, sweating, and friction worsened the eruptions, and that a similar, more limited episode had occurred the prior summer. [pmid:42359115]
Morphology varied by site. The neck and axillae had erythematous to hyperpigmented plaques with scaling, crusting, and superficial erosions. In contrast, lesions in the groin, lower abdominal folds, and limb flexures were described as predominantly papular and follicular, with marked post-inflammatory hyperpigmentation. The papules and macules were reported as pinpoint to 2–3 mm and could coalesce into plaques. [pmid:42359115]
The authors considered Hailey-Hailey disease, Darier disease, Grover disease, and Dowling-Degos disease in the differential diagnosis. A punch biopsy from a neck lesion showed suprabasal acantholysis and separation of keratinocytes, producing the reported “dilapidated brick wall” appearance. The biopsy description also included epidermal thinning, flattened rete ridges, dermal edema, chronic inflammatory infiltrate, and pigment incontinence. [pmid:42359115]
On clinicopathological correlation, the report identified Hailey-Hailey disease in this patient. Direct immunofluorescence was not performed because it was unavailable at the authors’ site. The patient received oral naltrexone, topical tacrolimus 0.1% ointment, and emollients; the report records marked clinical improvement at one-month follow-up. [pmid:42359115]
Analysis — Diagnostic Morphology
The central contribution of this case is not a frequency estimate or a treatment comparison. It is the documented coexistence of two clinical patterns in one person: more classical erosive and crusted plaques at the neck and axillae, alongside papular, follicular, and prominently pigmented lesions in other flexural areas. [pmid:42359115] That contrast explains why the diagnostic question extended beyond Hailey-Hailey disease to Darier disease, Grover disease, and Dowling-Degos disease. [pmid:42359115]
Within the report, histology narrowed that question. Suprabasal acantholysis with the described dilapidated brick wall pattern was interpreted together with the clinical distribution and morphology, rather than presented as a stand-alone conclusion. [pmid:42359115] The authors’ final diagnosis therefore rested on clinicopathological correlation. [pmid:42359115] For research interpretation, this is a useful illustration that an atypical papular or follicular appearance in flexural skin can complicate classification when other lesions in the same patient have erosive, scaling, or crusted features. [pmid:42359115]
The pigmentary component is also important to the report’s framing. Prominent post-inflammatory hyperpigmentation was described in the papular and follicular areas and contrasted with the more overtly erosive plaques elsewhere. [pmid:42359115] In this single observation, morphology was heterogeneous across anatomical sites; it should not be treated as evidence that this pattern is typical, common, or diagnostic on its own. The case instead supports a focused research question: how often do papular-follicular and pigmentary patterns occur within confirmed Hailey-Hailey disease, and how reliably can they be distinguished from the listed alternatives in larger, systematically assessed cohorts?
The reported one-month improvement followed a combination of oral naltrexone, topical tacrolimus, and emollients. [pmid:42359115] Because the treatments were given together and there was no comparator, the observation cannot isolate a treatment effect. It does, however, preserve the clinical sequence documented by the authors: diagnosis after biopsy and correlation, followed by combination treatment and reported improvement at follow-up. [pmid:42359115]
Limitations
This source is a single-patient case report. It cannot establish prevalence, comparative diagnostic accuracy, treatment efficacy, causation, or generalizable outcomes. [pmid:42359115] The atypical papular and follicular presentation was observed in one patient, so the report does not quantify how often it occurs in Hailey-Hailey disease. [pmid:42359115] Direct immunofluorescence was unavailable, which limits the reported workup. [pmid:42359115] Finally, the source’s broader background discussion cites prior literature; this briefing confines its conclusions to the case findings supplied here. [pmid:42359115]