Hair casts
| Hair casts | |
|---|---|
| Specialty | Dermatology |
Hair casts, also known as pseudonits, represent remnants of the inner root sheath, and often occur in great numbers and may mimic nits in the scalp.[1]: 764
Signs and symptoms
Hair casts are distinct, solid, shining, white, freely mobile, tubular accretions that measure 2 to 7 mm in length and wrap the scalp's hair shafts.[2]
Causes
Although the exact cause is frequently unknown, pityriasis amiantacea, seborrheic dermatitis, hair nodes, scalp psoriasis, traction-based hairstyles, and hair spray use have all been linked to their occurrence.[3]
Diagnosis
According to research using electron microscopy, the real peripillous hair casts are typically constituted of the exterior root sheath, with the internal root sheath occurring infrequently. Some are even composed of both the internal and external sheaths.[4]
Treatment
Coaltar or keratolitic shampoo treatment is not effective. The best results are obtained when the cylinders are manually removed using a comb and a 0.025% retinoic acid solution.[3]
See also
References
- ^ James, William; Berger, Timothy; Elston, Dirk (2005). Andrews' Diseases of the Skin: Clinical Dermatology. (10th ed.). Saunders. ISBN 0-7216-2921-0.
- ^ "Hair casts". Journal of the American Academy of Dermatology. 66 (4): AB99. 2012. doi:10.1016/j.jaad.2011.11.420.
- ^ a b França, Katlein; Silva, IsabellaRezende; Bedin, Valcinir; Villa, RicardoTadeu; de Carvalho, CristineAlmeida (2011). "Hair casts or pseudonits". International Journal of Trichology. 3 (2). Medknow: 121–122. doi:10.4103/0974-7753.90834. ISSN 0974-7753. PMC 3250010. PMID 22223977.
- ^ Taïeb, Alain (1985-08-01). "Hair Casts: A Clinical and Morphologic Study". Archives of Dermatology. 121 (8): 1009–1013. doi:10.1001/archderm.1985.01660080063015. ISSN 0003-987X. PMID 4026336.
Further reading
- Lokhande, Archana Jagdish; Sutaria, Amita (2017). "Adult Onset Hair Casts: Nits Which Do Not Itch!". International Journal of Trichology. 9 (2). Wolters Kluwer -- Medknow Publications: 70–72. doi:10.4103/ijt.ijt_30_17. PMC 5551310. PMID 28839391.
- Scott, Michael J.; Roenigk, Henry H. (1983). "Hair casts: Classification, staining characteristics, and differential diagnosis". Journal of the American Academy of Dermatology. 8 (1). Elsevier BV: 27–32. doi:10.1016/s0190-9622(83)70003-4. ISSN 0190-9622. PMID 6186702.