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F3Ch11 (113084): The epidermis shows irregular effacement of rete ridges. Melanocytes focally are hyperplastic. Keratinocyte, mostly in the superficial unit, and individually and in clusters, show a distinctive “balloon cell” transformation. This is a rather common finding in the epidermis in a fibrous papule. The pattern of collagen bundles in the upper portion of the field is characteristic of the changes seen in a fibrous papule. In the lower portion of the field, there is some evidence of collagenolysis. Vessels are ectatic. |
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