RESUMO
Lichen planopilaris (LPP) and frontal fibrosing alopecia (FFA) are lymphocyte-mediated scarring alopecias which clinically affect primarily the anterior and mid-scalp. However, unaffected scalp areas have not yet been investigated in a systemic manner. In this study, we assessed histopathologic changes in affected and unaffected scalp in both diseases and healthy control subjects and compared these findings with clinical signs and scalp symptoms. We have demonstrated that "normal-appearing" scalp that is devoid of clinical lesions of LPP and FFA showed lymphocytic perifollicular inflammation around the isthmus/infundibulum areas in 65% of biopsy specimens, perifollicular fibrosis in 15% and mucin deposits in 7.5% of the cases. None of these findings were found in control samples. No direct correlation was found between the degree of histopathological inflammation, scalp symptoms and clinical lesions in the corresponding affected scalp areas. This preliminary study suggests that both diseases may be more generalized processes which affect the scalp and therefore need systemic or total scalp therapy.
Assuntos
Alopecia/metabolismo , Fibrose/metabolismo , Líquen Plano/metabolismo , Couro Cabeludo/patologia , Adulto , Idoso , Idoso de 80 Anos ou mais , Alopecia/diagnóstico , Biópsia , Dermatologia , Feminino , Fibrose/diagnóstico , Humanos , Inflamação , Líquen Plano/diagnóstico , Linfócitos/patologia , Masculino , Pessoa de Meia-IdadeRESUMO
Lichen planopilaris (LPP) and frontal fibrosing alopecia (FFA) are lymphocytic scarring alopecias affecting primarily the scalp. Although both diseases may share some clinical and histopathological features, in the last decade, FFA has become an "epidemic" particularly in Europe, North and South America with unique clinical manifestations compared to LPP, thus, raising the idea that this disease may have a different pathogenesis. Symptoms such as scalp burning, pruritus or pain are usually present in both diseases, suggesting a possible role for nerves and neuropeptides in the pathogenesis of both diseases. Based on some previous studies, neuropeptides, such as substance P (SP) and calcitonin gene-related peptide (CGRP), have been associated with lipid metabolism and many chronic inflammatory disorders. In this study, we asked if these neuropeptides are associated with LPP and FFA scalp lesions. Alteration in the expression of SP and CGRP in affected and unaffected scalp skin from patients with both diseases was found with examination of sections using immunohistochemical techniques and confocal microscopy. We then quantitatively assessed and compared SP and CGRP expression from control, LPP and FFA scalp biopsies. Although LPP and FFA share similar histopathologic findings, opposite results were found in affected and unaffected scalp in the ELISA tests, suggesting that these diseases may have different pathogenic mechanisms. We also found presence of histopathological inflammation irrespective of evident clinical lesions, which raises the possibility that both diseases may be more generalized processes affecting the scalp.
Assuntos
Alopecia/patologia , Líquen Plano/fisiopatologia , Inflamação Neurogênica/patologia , Adulto , Idoso , Idoso de 80 Anos ou mais , Biópsia , Peptídeo Relacionado com Gene de Calcitonina/metabolismo , Doença Crônica , Epiderme/metabolismo , Feminino , Humanos , Imuno-Histoquímica , Inflamação , Metabolismo dos Lipídeos , Linfócitos/patologia , Masculino , Microscopia Confocal , Pessoa de Meia-Idade , Neuropeptídeos/química , Couro Cabeludo/patologia , Dermatoses do Couro Cabeludo/patologia , Substância P/metabolismoRESUMO
Acute traction alopecia is a diagnostic challenge when the external factor is not suspected or admitted. We report two female patients with non-scarring patchy alopecia resulting from traction of video-electroencephalogram electrodes in which the clinical diagnosis of alopecia areata was suspected. Associated diffuse hair disorders might be implicated in these cases. The correct diagnosis of traction alopecia is important in order to avoid unnecessary treatments.
RESUMO
BACKGROUND: Frontal fibrosing alopecia is considered a particular clinical form of lichen planopilaris that primarily involves the scalp hair over the frontal hairline. Concomitant involvement of vellus at different body sites has recently been reported. To our knowledge, this is the first report on the involvement of facial vellus by effects of the inflammatory process. Unlike the usual noninflammatory clinical presentation of vellus involvement over other body areas, facial vellus involvement can lead to surface changes that may be recognized both by patients and dermatologists. OBSERVATIONS: Four patients with typical clinical features of frontal fibrosing alopecia presented with noninflammatory follicular papules over the face, most often inside the temporal area, and described as "roughness" by the patients. Histologic samples showed lichen planopilaris features involving the facial vellus. CONCLUSIONS: The new concept of frontal fibrosing alopecia as a generalized disease is important for treatment planning and research. Dermatologists must learn to recognize facial surface changes and discuss these with the patients, who may attribute this roughness to aging or hormonal changes associated with menopause. Further studies are needed to determine the prevalence of this involvement in patients with frontal fibrosing alopecia.