<unk>  is often observed idiopathically in pregnant women, as well as women exposed to diethylstilbestrol both as a contraceptive or in-utero, however this association is not statistically significant. It has been suggested that HPV infection is an initial step towards the carcinogenesis in these lesions.
Microglandular hyperplasia
Sebaceous hyperplasia
Follicular hyperplasia
Neuroendocrine hyperplasia
Epithelial dysplasia
Atypical small acinar proliferation
Keratin pearl
Periapical cyst