Condylomata acuminata with pigmented papular lesions.

5 cases of condylomata acuminata with pigmented papular lesions were examined. By light microscopy, the pigmented papules showed benign basaloid cell proliferation and papillomatosis with only a few vacuolizations of the keratinocytes. Although mitotic figures increased in number, cellular atypia and disorderly arrangement were rarely observed. Electron microscopy revealed only benign epidermal cell proliferation. From these findings, the pigmented papules may be regarded as an initial stage or a forme fruste of condylomata acuminata. These papules are clinically very similar to the lesions of so-called multicentric pigmented Bowen's disease and the relationships between these two conditions are discussed.