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Circle hair is a rare body-hair disorder of unknown etiology, typically characterized by perfectly or nearly perfectly coiled hair located below the cornified layer of the skin. Its main histopathological features are dilated hair-follicle infundibula and entrapped hair shafts. After its first description in 1963, there have only been a small number of reported cases, and its pathophysiology remains unclear. Herein, we report a case of an 80-year-old woman with skin lesions and abnormal hairs on both legs. We also propose a possible mechanism of her circle hairs: it may have occurred as an effect of her acquired ichthyosis secondary to her underlying multiple myeloma. There is no specific treatment for circle hairs, and reassurance that it is a harmless condition is sufficient. We prescribed a topical humectant and keratolytic agent to moisten the skin and lessen the hair entrapment, which resulted in clinical improvement. As the pathogenesis of the disease is unknown, further studies are warranted.

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.

Circle hairs (CHs) represent a body hair growth disorder which is characterized by asymptomatic presence of hairs in typical circular or spiraliform arrangement. It is not associated with follicular or inflammatory abnormalities. CHs are rarely reported, probably underestimated, as medical consultation for CH only is rare in practice. It needs to be differentiated from rolled hairs, which is a relatively common disorder of hair growth associated with follicular hyperkeratosis and keratin plugging. Trichoscopy is a noninvasive technique to confirm the diagnosis without biopsy. We present a 20-year-old female who presented with CHs over bilateral upper and lower limbs involving extensors.

Pili multigemini and circle hairs (CHs) both are hair shaft deformities. Being asymptomatic and benign they are often under-reported in medical science. Till now, literature showed the involvement of only males. CHs are seen in obese individuals with sedentary lifestyle and pili multigemini is seen in adults over beard and children over scalp. Cosmetic concern in a young female with asymptomatic hyperpigmented papular lesions brought her to dermatology clinic. Apart from histopathology, dermatoscopy is a noninvasive technique that can be utilized for the evaluation of various hair disorders, especially like this.

Circle hairs (CH) represent a body hair growth disorder characterized by asymptomatic presence of hairs with typical circular or spiraliform arrangement, not associated with follicular or inflammatory abnormalities. Although this condition is rarely reported, it is probably underestimated, as a medical consultation for CH only is rare in practice. Trichoscopic and histopathological findings of CH have never been reported and this article will present and discuss six cases along with literature review.

Circle hairs are rarely reported. In this disorder of hair growth, the hairs grow in a perfect or nearly perfect circle in a subcomeal location. There is no associated follicular abnormality or inflammatory component. The circle hairs are interspersed among normal straight hairs. 1, 2 Rolled hairs, a common disorder of hair growth, are associated with follicular hyperkeratosis, keratin plugging, and sometimes inflammation. The condition is usually associated with keratosis pilaris, but it has also been associated with corticosteroid therapy, xerosis, neurodermatitis, and palmoplantar keratoderma.3, 4 The terms circle hairs and rolled hairs are commonly used interchangeably, but they denote clearly distinct entities. We describe five patients with circle hairs and discuss a possible pathogenic mechanism.

when extracted with a sharp blade, uncoiled to a length of less than 2.5 cm. When released, they either partially or fully recoiled. Rolled hairs are distinct from circle hairs. They are not perfectly circular like circle hairs, but are rather irregularly coiled within a hyperkeratotic papule. 3 A recent article erroneously used circle hairs and rolled hairs as synonymous terms. 5 The cause of circle hairs is unknown. We noted circle hairs to be slightly smaller in diameter than normal straight hairs. The two prior articles did not comment on the relative diameter of circle hairs. We also noted that all five of our patients were obese and elderly and had abundant body hair. The prior articles did not comment on the degree of hairiness of their patients. There appeared to be no association with frequency of bathing in our patients. One possible explanation for circle hairs may be a small-diameter hair that is unable to penetrate the stratum comeum as a larger-diameter hair does and thus grows in a circular tract in a subcorneal location. We believe that circle hairs are more common than reported because they are rarely looked for; in addition, they are easily overlooked because they occur predominantly in hairy persons.