The criteria for malignant change in the pigmented nevus include an increase in pigmentation, rapid growth, or evidence of inflammation. Inflammation may not necessarily constitute positive evidence of malignancy in a pigmented nevus. The following case reports illustrate subjective and objective changes in benign pigmented nevi as a result of inflammation.
Case 1.—Man aged 27 years had a "mole" on his left forearm for many years (Fig. 1). A month before examination the "mole" became sore and the underlying area became firm to the touch. Examination (Oct. 22, 1955) revealed a 6 mm., elevated, round, pink, nonhairy, soft papule on the left forearm. There was a 4 mm. zone of induration, without erythema, about the lesion. No increase in pigmentation had been noted. The lesion was excised to determine the nature of the induration. Healing was satisfactory.
This tissue, as examined by Dr.
SAUNDERS TS. Abscess Formation in Pigmented NeviReport of Three Cases. AMA Arch Derm. 1957;76(2):189–192. doi:10.1001/archderm.1957.01550200033007
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