LL-37 · research summary

Scalp Rosacea: Current Evidence.

Dermatology and therapy · 2026. Summary drawn from the study's full text. Each statement is followed by the exact sentence it comes from. This is a research summary, not medical advice.

Study type

Narrative review synthesizing current evidence on pathogenesis, clinical presentation, and management of scalp rosacea
“The aim of this review is to synthesize current evidence on the pathogenesis, clinical presentation, trichoscopic and histopathologic features, differential diagnosis, and therapeutic approaches to scalp rosacea, in order to improve its recognition and clinical management.”

Subjects

Patients with scalp rosacea, predominantly middle-aged men
“It predominantly affects men aged 40 and 60 years, with a reported mean age of 47.95 years [2, 4].”

Reported findings

Scalp rosacea is characterized by diffuse erythema, scaling, and vascular alterations, with trichoscopy revealing specific patterns like caterpillar hair vessels and arborizing vessels
“In a pilot study of 21 biopsy-confirmed cases, Lin et al. reported “caterpillar hair vessels” (86%), thin arborizing vessels (76%), rhomboid polygonal structures (71%), and thick arborizing vessels (67%) as the most frequent vascular findings, often occurring in combination (Fig. 2) [2].”
The condition is associated with immune dysregulation and Demodex folliculorum infestation, which may act as a reservoir for the mites
“Interestingly, facial positivity frequently coincided with scalp involvement, suggesting that the scalp may act as a Demodex reservoir and contribute to recurrent disease [3, 7].”
The prognosis is favorable as the condition does not progress to scarring alopecia, and oral tetracyclines are a cornerstone of systemic therapy
“Importantly, the condition does not progress to scarring alopecia, regardless of disease extent or duration, although transient hair shedding may occasionally occur [1, 9].”

Limitations stated by the authors

No standardized diagnostic criteria or therapeutic guidelines have been established, and pathogenesis is largely extrapolated from facial rosacea
“However, it is important to note that no studies have specifically investigated the pathogenic mechanisms underlying scalp rosacea. Consequently, current concepts regarding RSD pathogenesis are largely extrapolated from data obtained in facial rosacea.”

Source: PubMed 42541637 · DOI 10.1007/s13555-026-01871-2 · all study summaries

Study type

Narrative review synthesizing current evidence on pathogenesis, clinical presentation, and management of scalp rosacea

“The aim of this review is to synthesize current evidence on the pathogenesis, clinical presentation, trichoscopic and histopathologic features, differential diagnosis, and therapeutic approaches to scalp rosacea, in order to improve its recognition and clinical management.”

Reported findings

Scalp rosacea is characterized by diffuse erythema, scaling, and vascular alterations, with trichoscopy revealing specific patterns like caterpillar hair vessels and arborizing vessels

“In a pilot study of 21 biopsy-confirmed cases, Lin et al. reported “caterpillar hair vessels” (86%), thin arborizing vessels (76%), rhomboid polygonal structures (71%), and thick arborizing vessels (67%) as the most frequent vascular findings, often occurring in combination (Fig. 2) [2].”

The condition is associated with immune dysregulation and Demodex folliculorum infestation, which may act as a reservoir for the mites

“Interestingly, facial positivity frequently coincided with scalp involvement, suggesting that the scalp may act as a Demodex reservoir and contribute to recurrent disease [3, 7].”

The prognosis is favorable as the condition does not progress to scarring alopecia, and oral tetracyclines are a cornerstone of systemic therapy

“Importantly, the condition does not progress to scarring alopecia, regardless of disease extent or duration, although transient hair shedding may occasionally occur [1, 9].”

Limitations stated by the authors

No standardized diagnostic criteria or therapeutic guidelines have been established, and pathogenesis is largely extrapolated from facial rosacea

“However, it is important to note that no studies have specifically investigated the pathogenic mechanisms underlying scalp rosacea. Consequently, current concepts regarding RSD pathogenesis are largely extrapolated from data obtained in facial rosacea.”