Hematoxylin-eosin–stained sections revealed central epidermal thinning with an overlying serous crust. Within the dermis, there was a dense infiltrate of histiocytic cells admixed with numerous eosinophils and a few scattered lymphocytes. The histiocytes had large round or reniform, vesicular, pale-staining nuclei with prominent nucleoli and abundant eosinophilic ground glass cytoplasm. Focal extravasation of red blood cells were seen in the papillary dermis. No mitotic figures or epidermotropism was noted.
Solitary Congenital Nodule in an Infant. Arch Dermatol. 1998;134(5):625-630. doi: