Objective: Bitemporal alopecia may occur in association with various hair diseases. However, it has not yet been officially classified as a distinct type of alopecia. This study aimed to identify hair diseases that commonly accompany bitemporal hair loss and to evaluate the clinicodemographic characteristics of affected patients.

Materials and Methods: This study included 86 patients aged ≥18 years with bitemporal alopecia. Clinicodemographic characteristics and concomitant hair diseases were recorded. The severity of bitemporal alopecia was classified into three categories: mild, moderate, and severe.

Results: The mean age of the patients was 36.2±15.7 years. Of the participants, 58.1% were female and 41.9% were male. Most patients were in the 18-24 (29.1%) and 25-34 (25.6%) age groups. A positive hair pull test was observed in 45 patients. Bitemporal alopecia was classified as mild in 22 patients (25.6%), moderate in 40 patients (46.5%), and severe in 24 patients (27.9%). Hair diseases accompanying bitemporal alopecia included androgenetic alopecia (n=57, 66.3%), seborrheic dermatitis (n=38, 44.2%), telogen effluvium (n=29, 33.7%), traction alopecia (n=11, 12.8%), lichen planopilaris (n=5, 5.8%), alopecia areata (n=3, 3.5%), frontal fibrosing alopecia (n=2, 2.3%), and anagen effluvium (n=1, 1.2%). The most frequent coexisting conditions were androgenetic alopecia (25.6%), androgenetic alopecia with seborrheic dermatitis (25.6%), seborrheic dermatitis with telogen effluvium (9.3%), androgenetic alopecia with telogen effluvium (8.1%), seborrheic dermatitis with telogen effluvium and traction alopecia (5.8%), and other combinations.

Conclusion: Bitemporal alopecia may serve as a potential predictive indicator for the diagnosis and follow-up of associated hair diseases.