In 1975, Kornberg and Ackerman (6) reported that pigmented RN could closely resemble superficial spreading malignant melanoma (SSMM), both clinically and histologically, and proposed the term pseudomelanoma to describe this benign phenomenon.
The clinical appearance of pseudomelanoma was described as variegated pigmentation, with jet-black foci resembling SSMM; the authors (6) suggested that this change resulted from scattering of melanocytes through the stratum corneum.
In 1986, Trau et al (7) reported a case of pseudomelanoma after C[O.
Park et al (3) concluded that RN with atypical features rarely resembled SSMM, thereby posing "significant diagnostic difficulties," but added that most RN did not mimic melanoma histologically; therefore, they did not recommend the term pseudomelanoma.
Given the rarity of RN cases that seem indistinguishable from melanoma, the term pseudomelanoma, although established in the literature, seems applicable to at best a small minority of RN, and in our view is best eschewed.
Pseudomelanoma following laser therapy for congenital nevus.
Recurrent melanocytic nevi after Solcoderm therapy: a new cause of pseudomelanoma.