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Figure 2. Microstructure of the skin from different body areas. A: lower left arm, B: penis, C: small labia. Note the dense dermal structure with multiple vessels in (A) and lose collagen bundles in (B) and (C) with high similarity of penile and labial skin. D: panel HE staining, E and F: Elastica van Gieson staining. Arrow upper panel depicting epidermis, pD papillary dermis, rD reticular dermis. Note abundance of collagen fibres in arm skin (red staining, black arrow; panel E and F) and abundant elastic fibres in penile and labial skin (black staining, white arrows). Scale bar in A for upper two panels 500 µm, lower panel 40× magnification. G-O: Masson Trichrome staining for visualization of collagen fibres (blue staining) in normal and scar tissues of different origin. G, H, I, N normal skin, K, L, M, O scar tissue; G and K breast, H and L scrotum, I and M penis, N and O abdomen. Note abundant collagen bundles in normal breast and abdominal skin (G and N) and densely packed collagen bundles in scar tissue of breast and abdomen (K and O, respectively). Thickened dermal tissue in breast scar (K). Loose connective tissue with scrotal (H, L) and penile (I, M) normal and scar tissue without densely packed collagen bundles as seen in non-genital scar tissue. Scale bars next to each specimen indicating magnification