linear focal elastosis linear focal elastosis linear focal elastosis or elastotic striae is a skin condition that presents with asymptomatic, palpable or atrophic, yellow lines of the middle and lower back, thighs, arms and breasts. histopathology: accumulation of fragmented elastotic material within the papillary dermis and transcutaneous elimination of elastotic fibers. linear focal elastosisother nameslinear focal dermal elastosiselastotic striae