We disagree with the conclusion reached by Dr Lisa Cohen in the last 2 paragraphs of her recent editorial.1 She hypothesized that the hybrid lesions described in our article2 could be the result of a collision between an acquired speckled lentiginous nevus and a classic congenital melanocytic nevus. However, we described several hybrid lesions where the 2 components were admixed, as in a marble cake, not simply next to one another, as in a layer cake. To suggest that this represents a collision lesion of 2 independent entities would be analogous to being served a marble cake and speculating that the chocolate portion was baked on Monday, the vanilla portion on Tuesday, and the 2 mixed together on Wednesday.
Schaffer JV, Orlow SJ, Lazova R, Bolognia JL. Speckled Lentiginous Nevus–Classic Congenital Melanocytic Nevus Hybrid Not the Result of "Collision". Arch Dermatol. 2001;137(12):1655. doi: