Pressure-induced alopecia (PA) is an unusual pattern of circumscribed hair loss that occurs after ischemic changes on the scalp. Trichoscopic findings described in the literature are scarce, nonspecific, and include black dots, broken hairs, circle hairs, and erythema. However, we report 3 cases of PA in which trichoscopy also showed many vellus and thin hairs. Possibly, the maintenance of these hair shafts may be explained by the more superficial insertion of their bulbs on the skin and/or their lower metabolic rates, making them suffer less from local hypoxia. Therefore, the authors suggest that these relevant signs should be added as a clue for the diagnosis of PA in doubtful cases.
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| http://dx.doi.org/10.1159/000504233 | DOI Listing |
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Pressure alopecias: A review.
J Am Acad Dermatol
January 2024
Trichology Clinic, Department of Dermatology, Hospital General "Dr. Manuel Gea González," Mexico City, Mexico. Electronic address:
Article Synopsis
- Pressure-induced alopecias (PAs) are a rare hair loss condition triggered by restricted blood flow to the scalp due to external pressure, occurring in two types: type 1 from prolonged pressure (such as during surgeries) and type 2 from cosmetic procedures involving injectables.
- Type 2 PA is becoming more common and can be confused with vascular occlusion-induced alopecia, highlighting the need for accurate diagnosis through clinical evaluation and potential use of trichoscopy.
- While hair loss can be evident, the condition is often self-limiting, with most cases seeing hair regrowth; treatment is generally unnecessary, but prognosis varies based on the extent of ischemia and response to timely interventions
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Background: Pressure-induced alopecia is an uncommon type of alopecia. It can occur in both scarring as well as non-scarring form and occurs due to ischemia resulting from prolonged head immobilisation during surgery or hospitalisation. The patchy hair loss generally involves convexities of scalp specially vertex and occiput.
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