PMC4748758_01
a Clinical appearance of the lesion in 2014: an atrophic plaque with a violaceous border and two small ulcers (arrows). b Clinical appearance of the scald in 2011: a small ulcer indicated by a star ( ) healed without developing NL but left a slight depigmentation.
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F1
A 49-year-old man was referred to our dermatology department in 2014 with a discoloured plaque that had two small ulcers on the frontal aspect of his right lower leg in 2014 (fig. 1a). He was scalded on his right leg with hot water in 2011 (fig. 1b) and this discoloured lesion coincided with a previous scald, except for a small shallow burn that healed with slight depigmentation.
a Low-power histological view showing a dense infiltration in the dermis and degeneration of the collagen fibres in the deep dermis [hematoxylin and eosin stain (HE), original magnification x16]. b High-power histological view showing infiltration of lymphocytes, histiocytes and neutrophils in the upper dermis (HE, original magnification x200). c High-power histological view showing the degenerated collagen fibres with palisading by mononuclear cells in the deep dermis (HE, original magnification x200).
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F2
A skin biopsy was performed from the atrophic area adjacent to the violaceous erythema and showed dense infiltration of lymphocytes, histiocytes, and neutrophils in the dermis (fig. 2a, b) as well as degenerated collagen fibres with signs of palisaded arrangements of the infiltrating cells (fig. 2c).