Unveiling Spiky Follicular Mycosis Fungoides: A New Trichoscopic Perspective
"Discover how spiky follicular mycosis fungoides presents a unique trichoscopic feature, aiding in early diagnosis and treatment."
Mycosis fungoides (MF) is a type of cutaneous T-cell lymphoma that primarily affects the skin. While the condition typically manifests as patches, plaques, or tumors, there are several variants, including folliculotropic mycosis fungoides (FMF). FMF involves the hair follicles and can present unique diagnostic challenges.
Recently, a case study highlighted an unusual presentation of FMF known as spiky follicular mycosis fungoides. This variant is characterized by hyperkeratotic spiky follicular papules, primarily located on the trunk and extremities. The discovery of this unique dermoscopic feature offers a new perspective for diagnosing and managing this rare condition.
This article delves into the specifics of spiky follicular mycosis fungoides, its clinical presentation, diagnostic approaches, and potential treatment strategies. By understanding this rare variant, healthcare professionals can improve early detection and provide more effective care for affected individuals.
Trichoscopic Findings and Evidence Base
Folliculotropic mycosis fungoides is described as a rare clinicopathological variant of mycosis fungoides characterized by preferential infiltration of the follicular epithelium. Trichoscopy has revealed decreased pilosebaceous units, dilated follicular openings, black dots, vellus and dystrophic hairs. Scalp examination may also show widespread white scaling with dotted and spermatozoa-like vessels. A 2025 review reported that 10 articles met its inclusion criteria after exclusions.
Diagnosis and Misdiagnosis
FMF is diagnosed in the context of prominent folliculotropism on histopathology, while its clinical presentations are polymorphic and may include follicular papules, plaques, alopecia and other nonspecific lesions. The head and neck predilection and nonspecific appearance can lead to frequent misdiagnosis. Trichoscopic assessment may assist evaluation by identifying follicular patterns and spermatozoa-like vessels, but a retrospective study described in a 2025 systematic review examined 1,338 patients with mycosis fungoides seen at a tertiary cutaneous T-cell lymphoma referral center from 1987 to 2015.
What is Spiky Follicular Mycosis Fungoides?
Spiky follicular mycosis fungoides is a rare clinicopathological presentation of FMF, characterized by multiple hyperkeratotic spiky follicular papules. These papules are mainly located on the trunk and extremities, making them distinct from other forms of mycosis fungoides.
- Clinical examination revealed extensive scalp involvement with hyperkeratotic alopecic patches, infiltrated papules, and cysts.
- Multiple erythematous papules and plaques were observed on the trunk and extremities.
- Careful inspection revealed numerous yellow millimetric filiform keratotic spicules on the neck and upper back.
- The palms and soles were spared.
Emerging Trichoscopic Perspective
A review of trichoscopy beyond hair and scalp diseases reported follicular spicules in a patient with folliculotropic mycosis fungoides. These spicules consisted of thick coats of keratinaceous debris around dilated openings and hair shafts. In a series of 18 scalp-involved cases, lesions presented as generalized alopecia in 27.8% of patients or patchy-plaque alopecia in 72.2%, while another report analyzed dermoscopic features in 11 patients with nonscalp FMF.
Scalp and Nonscalp Features
The available reports describe different clinical and dermoscopic contexts for mycosis fungoides. One report involved an 89-year-old patient with extensive skin involvement and palpable but pathologically uninvolved lymph nodes. In contrast, dermoscopy of a nonscalp thigh lesion showed hair shafts that rapidly tapered over long sections within a patchy erythematous scaly lesion.
Advancing Diagnosis and Treatment
The identification of spiky follicular mycosis fungoides as a distinct dermoscopic entity enhances our ability to diagnose and treat this rare condition effectively. Further research and case studies will help refine our understanding and improve patient outcomes. By recognizing these unique features, dermatologists can provide more targeted and effective interventions, improving the quality of life for those affected by this challenging condition.