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Ann Dermatol 2020 Jun 24;32(3):258-259. Epub 2020 Apr 24.

Division of Dermatology, National University Hospital, Singapore.

Case Rep Dermatol 2020 Sep-Dec;12(3):178-185. Epub 2020 Oct 30.

Division of Dermatology, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok, Thailand.

Trichostasis spinulosa (TS) is a follicular disorder characterized by the retention of multiple vellus hairs in a hyperkeratotic dilated hair follicle. TS is considered as a common disorder; however, it is often underdiagnosed due to its asymptomatic nature. Although the condition frequently affects the face or extremities, the widespread distribution of TS over the entire body has been once reported in a patient with chronic renal failure. Read More

Skin Appendage Disord 2020 Jul 25;6(4):220-223. Epub 2020 Jun 25.

Department of Dermatology, LTMMC and LTMGH, Sion West, Mumbai, India.

Introduction: Many dermatological conditions require extraction of material from the lesion followed by visualization under a microscope. However, visualization of the extracted material can be done using a dermoscope instead. We propose "extraction dermoscopy" as an addition to the already existing treasury that dermoscopy holds. Read More

Dermatol Ther 2020 07 19;33(4):e13513. Epub 2020 May 19.

University of Studies Guglielmo Marconi, Rome, Italy.

Skin Appendage Disord 2018 Oct 13;4(4):291-295. Epub 2018 Feb 13.

Department of Dermatology, University Hospital Hassan II, Fez, Morocco.

Background: Data about the contribution and the implications of dermoscopy in trichostasis spinulosa (TS) are lacking in the literature.

Objective: To describe dermoscopic features of TS in a large sample of patients and to correlate dermoscopy with clinical characteristics of the patients and therapeutic responses to medical treatments.

Methods: A descriptive study was conducted (from October 2015 to June 2016) at the Department of Dermatology of Fez in Morocco. Read More

Eur J Dermatol 2018 Aug;28(4):531-532

Department of Dermatology, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan.

Int J Trichology 2018 Jan-Feb;10(1):21-23

Clear Skin Clinic, Karad, Maharashtra, India.

Context: Trichostasis spinulosa (TS) is a common but underdiagnosed follicular disorder involving retention of successive telogen hair in the hair follicle. Laser hair removal is a newer treatment modality for TS with promising results.

Aims: This study aims to evaluate the efficacy of 800 nm diode laser to treat TS in Asian patients. Read More

Am J Dermatopathol 2017 Aug;39(8):e106

Department of Dermatology, Clinical University Hospital of Valencia, Valencia, Spain.

Trichostasis spinulosa is a rarely diagnosed disorder of the pilosebaceous unit, characterized by retention of telogen hairs within the dilated follicles. A hair tuft can be seen protruding from the follicles. We present a case of trichostasis spinulosa associated with intradermal melanocytic nevi, where dermoscopy helps to identify this entity. Read More

Int J Trichology 2016 Apr-Jun;8(2):78-80

Department of Dermatology, Venereology and Leprosy, Grant Government Medical College, Mumbai, Maharashtra, India.

Trichostasis spinulosa (TS) is very common yet unrecognized disorder of the hair follicle. Usually occurring on the mid-face, especially on the nose, TS occurs more commonly in young, adult dark skinned women. Here, we present a case of TS at an unusual site diagnosed on the basis of history, hair mount, dermoscopy, and histopathology. Read More

Rev Iberoam Micol 2016 Oct - Dec;33(4):258-259. Epub 2016 Jul 26.

Unidad de Patología, Hospital de Barbastro, Barbastro, Huesca, España.

Int J Trichology 2016 Jan-Mar;8(1):21-3

Department of Pathology, ESI-PGIMSR and ESIC Medical College, Kolkata, West Bengal, India.

Trichostasis spinulosa (TS) is a relatively common but underdiagnosed disorder of the pilosebaceous follicles in which there is follicular hyperkeratosis of a dilated hair follicle with retention of telogen hairs. Clinical presentation of this disorder can be confused with comedogenic acne, keratosis pilaris, eruptive vellus hair cysts, and Favre-Racouchot syndrome. A case of a nonpruritic variant of TS in a 16-year-old boy is reported because of its unusual location as well as presentation in the lower eyelid, giving an appearance of a double eyelid. Read More

Int J Dermatol 2016 Sep 13;55(9):989-94. Epub 2015 Nov 13.

Department of Dermatology, Al-Kuwait University Hospital, Sana'a University, Sana'a, Yemen.

Background: Trichostasis spinulosa (TS) is a common, underdiagnosed cosmetic skin condition.

Objectives: The main objectives of this study were to determine the occurrence of TS relative to age and gender, to analyze its cutaneous distribution, and to investigate any possible familial basis for this condition, its impact on patients, and the types and efficacy of previous treatments.

Methods: All patients presenting to the outpatient dermatology clinic at the study institution and their relatives were examined for the presence of TS and were questioned about family history and previous treatment. Read More

Dermatol Surg 2015 Jul;41(7):867-9

Departments of Radiology and Dermatology, Institute for Diagnostic Imaging and Research of the Skin and Soft Tissues, Clinica Servet, Faculty of Medicine, University of Chile, Santiago, Chile Department of Medicine, Southern Illinois University School of Medicine, Springfield, Illinois.

J Clin Virol 2015 Apr 20;65:76-82. Epub 2015 Feb 20.

Department of Pathology, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan. Electronic address:

Background: Trichodysplasia spinulosa-associated polyomavirus (TSV) was identified in, and shown to be the probable cause of, trichodysplasia spinulosa, a rare skin disease. To date, serological analyses have revealed that TSV infection is common among adults in the general population of Europe and Australia. However, there have been no reports of TSV in Asia. Read More

J Am Acad Dermatol 2015 May 5;72(5):890-900. Epub 2015 Mar 5.

Department of Dermatology and Cutaneous Surgery, University of Miami L. Miller School of Medicine, Miami, Florida.

Dermoscopic examination of hair and scalp, also named "trichoscopy," is an essential tool in diagnosis of hair and scalp diseases. Trichoscopy is fast and noninvasive and can be used to evaluate hair disorders in all body areas. Body hair disorders are uncommon, and most publications on their dermoscopic features are limited to case reports or series. Read More

Indian Dermatol Online J 2014 Dec;5(Suppl 2):S132-3

Department of Dermatology, Sri Dharmasthala Manjunatheshwara College of Medical Sciences and Hospital, Sattur, Dharwad, Karnataka, India.

JAMA Dermatol 2014 Nov;150(11):1234-6

Department of Dermatology, University of Texas Medical School at Houston, Houston.

An Bras Dermatol 2014 Jul-Aug;89(4):685-7

Universidade de São Paulo, São Paulo, SP, Brazil.

Alopecia areata is a common autoimmune disorder that leads to nonscarring hair loss. Black dots, also called comedo-like cadaver hairs, can be found in almost 50% of alopecia areata patients and indicate disease activity. Trichostasis spinulosa is a follicular disorder resulting from the retention of numerous hairs surrounded by a keratinous sheath in dilated follicles. Read More

Eur J Dermatol 2014 May-Jun;24(3):416-7

Başkent University, Department of Dermatology, Ankara, Turkey.

Int J Dermatol 2013 Dec;52(12):1586-8

Department of Pathology and Immunology, Washington University School of Medicine, St Louis, MO, USA E-mail:

J Am Acad Dermatol 2013 Nov;69(5):e223-e225

Department of Dermatology, School of Medicine, Taipei Medical University, Taipei, Taiwan; Department of Dermatology, Shuang Ho Hospital, Taipei Medical University, Taipei, Taiwan; Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei, Taiwan. Electronic address:

Int J Trichology 2012 Oct;4(4):273-4

Department of Dermatology, Ankara Occupational Diseases Hospital, Ankara, Turkey.

Trichostasis spinulosa (TS) is a common but rarely diagnosed disease. For diagnosis, it's sufficient to see a bundle of vellus hair located in a keratinous sheath microscopically. In order to obtain these vellus hair settled in comedone-like openings, Standard skin surface biopsy (SSSB), a non-invasive method was chosen. Read More

APMIS 2013 Aug 18;121(8):770-82. Epub 2013 Apr 18.

Department of Medical Microbiology, Leiden University Medical Center, Leiden, the Netherlands.

Trichodysplasia spinulosa-associated polyomavirus (TSPyV) is a new species of the family Polyomaviridae that was discovered in 2010. TSPyV infects humans and is associated with the development of a rare disease called trichodysplasia spinulosa. Trichodysplasia spinulosa is a skin disease of severely immunocompromised hosts characterized by follicular distention and keratotic spine formation especially on the face. Read More

Lasers Med Sci 2011 Nov 13;26(6):825-9. Epub 2011 Aug 13.

Dermatology Unit, National Institute of Laser Enhanced Science, Cairo University, Cairo, Egypt.

Trichostasis spinulosa (TS) is a follicular disorder in which multiple hairs in a keratinous sheath project above the skin surface. Current treatments provide temporary relief and side effects are common. We report the successful treatment of TS in 20 patients using a short-pulsed 755-nm alexandrite laser. Read More

Int J Trichology 2011 Jan;3(1):44-5

Department of Pathology, Smt. Kashibai Navale Medical College and General Hospital, Narhe, Pune, Maharashtra, India.

Arch Dermatol 2010 Dec;146(12):1434-5

Cases J 2009 Dec 11;2:9310. Epub 2009 Dec 11.

Department of Pathology, Creighton University Medical Center, Omaha, NE, 68131, USA.

Introduction: Usual causes of a papule or nodule in a post-operative site after resection of a skin tumor are residual or recurrent tumor, proliferative scar, or suture granuloma with inflammation and granulation tissue. Inverted or trapped hair, an acquired trichostasis, has not been implicated as a cause in such cases, this is probably the first case reported in literature.

Case Presentation: A 31-year-old woman underwent an excision of a ruptured epidermal cyst of the left axilla. Read More

J Eur Acad Dermatol Venereol 2010 Apr 23;24(4):470-3. Epub 2009 Sep 23.

Department of Dermatology, Tehran University of Medical Sciences, Razi Hospital, Vahdat-Eslami Square, Tehran, Tehran, Iran.

Background: Trichostasis spinulosa (TS) is a common disorder of hair follicle, characterized by spinous plugs. Topical treatments offer temporary relief but permanent removal of the abnormal follicles using hair removal lasers may result in a definite cure.

Objective: To evaluate the safety and efficacy of 755-nm alexandrite laser for the treatment of TS lesions. Read More

J Eur Acad Dermatol Venereol 2010 Mar 8;24(3):362-3. Epub 2009 Sep 8.

Arch Dermatol 2008 Aug;144(8):1088

Homerton University Hospital, London, England.