This is a retrospective study of 232 patients, and a prospective survey of 48 patients, regarding susceptibility factors in tinea versicolor, particularly in association with seborrheic dermatitis. In both surveys, a higher (10.4%) than expected (3.8%) percentage of association with seborrheic dermatitis was found.
(Arch Dermatol 115:966-968, 1979)
Faergemann J, Fredriksson T. Tinea Versicolor With Regard to Seborrheic DermatitisAn Epidemiological Investigation. Arch Dermatol. 1979;115(8):966-968. doi:10.1001/archderm.1979.04010080030017