Lines of Blaschko

Bilateral linear lichen planus along the lines of Blaschko: Report of a rare case and brief review

“…In one meta-analysis, 16% of LP patients had hepatitis C infection [14]. To date, no systemic associations, including hepatitis C have been reported with Blaschkoid LP [9], while other variants of linear LP may show such associations [15]. In our reported case, serology tests for hepatitis B and C were negative.…”

“…Linear LP has been described in less than 1% of all LP patients [3]. Almost all of the reported cases of linear lichen planus along the lines of Blaschko presented unilaterally [3][4][5][8][9][10]. We herein report a rare case of bilateral linear Blaschkoid lichen planus.…”

“…Another source of confusion is the role of Koebner phenomenon in development of linear LP lesions. The koebner phenomenon satisfactorily explains most cases with linear as well as the zosteriform distribution of LP because they have appeared either secondary to a known trauma or in the healed lesions of a preexisting disease such as herpes zoster [2,3,9]. The exact cause of the Blaschkoid pattern of LP has not yet been verified but there is no evidence to support the role of Koebner phenomenon in its etiology.…”

“…To solve this controversy, Blaschko lines should be clearly distinguished from other linear patterns such as lines of innervation of spinal nerves (dermatomes), Langer's lines, etc. [5,9]. Zosteriform (dermatomal) patterns consistently correspond to the areas that are innervated by the spinal nerves but Blaschko lines follow some distinct developmental patterns and are V-shape over the upper spine, S-shape on the abdomen, inverted U-shape from the breast area onto the upper arm and perpendicular over the front and back of the lower extremities [10].…”

Two Cases of Linear Alopecia on the Occipital Scalp

“…In terms of a linear lesion in dermatology, quite a few dermatoses could show such a linear distribution on any part of the body. These dermatoses include linear scleroderma, linear lupus erythematosus, linear lichen planus, linear psoriasis, linear epidermal nevus etc 1 . All of the lesions of these dermatoses show visible cutaneous changes such as papules, scales, depression or elevation, hardening etc.…”