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Pigmentary demarcation lines (PDLs), also known as Futcher or Voigt lines, present as an abrupt transition between areas of light and dark pigmentation. They consist of eight specific patterns, labeled A through H, among which types C and E are hypopigmented markings. In this paper, we described two girls with some bizarre hypopigmentation on their chest. Based on the clinical features, these lesions were diagnosed as types E and C of PDLs. No similar lesions were observed in their parents and younger brother. To our knowledge, types E and C of PDLs occurring in Chinese siblings have not previously been reported. We hope that the observation would help to understand the pathogenesis of PDLs.