Case Year of publication Age Gender Nationality Duration of exposure Daily use of laptop Location of the lesion Description of the lesion References 1 2004 50 Male Not reported 2 weeks considerable amount of time each day The left anterior thigh well-defined, brown, mildly erythematous, reticulated patch 10 2 2004 48 Female Dutch Not reported Not reported The right thigh more than the left. patchy reticulate pigmentation 11 3 2006 17 Female French 1 year 6-8 hours The front of the thighs, more pronounced on the left thigh patchy reticulated mildly erythematous to brownish lesions, non blanchable 12 4 2007 26 Female Indian-American Not reported 6 hours right thigh patch of reticulated hyperpigmentation 13 5 2007 40 Female American Not reported Not reported The thighs reddish-brown, reticulated eruption 14 6 2009 26 Male French Not reported several hours every day The anterior aspect of the right thigh, more discrete on the left thigh reticular and macular, brown pigmentation, fixed, nonmigrating, and not blanchable. 15 7 2009 25 Female French 6 months 6 hours The front two legs, predominantly on the left thigh asymmetrical, discrete erythematous lesions initially, having evolved into a fixed pigmentation, painless, non-itchy. 16 8 2009 21 Male Turkish 3 months Not reported The left thigh reticulated, dark reddish brown pigmented patch with an undefined border 17 9 2010 15 Male American Several months daily both thighs, but more pronounced on the left. a livedo reticulares-like eruption 18 10 2010 17 Female Italian 1 year Not reported the left anterior thigh brown, reticular, nonblanchable cutis marmorata with burning and itching 19 11 2010 9 Male Swedish Not reported Not reported The left thigh Reticular hyperpigmentation 20 12 2010 12 Male Swiss Not reported several hours per day left upper thigh only well defined, brownish-pigmented, reticulate, livedolike lesion, mildly erythematous with telangiectasias 21 13 2010 20 Female Canadian longstanding daily The front of the thighs pigmentation in a net-like distribution 22 14 2011 12 Female Brazilian 11 months several hours the anterior surface of the both thighs, but more visible on the dorsal surface of the right thigh 20-cm brownish macules with mild erythema along the edges. The lesion was affecting both thighs, but was more visible on the dorsal surface of the right thigh 23 15 2011 18 Female Not reported Not reported frequently The left breast, mainly over the upper medial quadrant 8*6-cm area of reticulated, brownish, macular pigmentation on a background of faint dusky erythema 24 16 2011 24 Female Canadian 9 months Not reported The anterolateral aspect of the thighs reticulated, erythematous to dull brownpattern 25 17 2012 20 Male Indian 2 years 2 to 3 hours one side of the abdomen diffuse reticular brownish hyperpigmentation 26 18 2012 16 Male Canadian Not reported on a daily basis Mid of the left thigh and progressed upwards toward the groin. patch diffusely hyperpigmented, reticulate, and morbilliform violaceous-brown with minimal scaliness, warm to touch. 27 19 2012 20 Female Spanish Not reported several hours a day The anterior aspect of the left thigh reticulated hyperpigmented macule with poorly defined borders 28 20 2012 24 Male Spanish Not reported Not reported The anterior aspect of the left thigh hyperpigmented macule with ill-defined borders 28 21 2012 21 Female Not reported 2 years Not reported lower legs more pronounced on the left net-like Hyperpigmented, reticulated lesions 2 22 2013 36 Female German 18 months 1 hour the anterior aspect of both thighs reticulated, reddish-brown macules with an ill-defined border 29

Table 1: Main characteristics of the all case reports.