Relative cell proliferation of (A) keratinocyte (HaCaT) and (B) human follicle dermal papilla (hDP) cells after incubation with bimatoprost (BIM) in ethanol, BIM topical formulations (BIM–TFs), and vehicle (BIM–TF#5 diluted to BIM concentrations of 0.01, 0.1, 0.5, 1, 2.5, 5, and 10 µM BIM), and 5% minoxidil in ethanol diluted to a concentration equivalent to that of 10 µM minoxidil. **p<.01, ***p<.001 compared to vehicle (BIM–TF#5); #p<.05, ##p<.01, ###p<.001 compared to BIM in ethanol; $p<.05, $$$p<.001 compared to BIM–TF#1; &&p<.01, &&&p<.001 compared to BIM–TF#5. Relative scratch wound recovery of hDP cells after incubation with BIM in ethanol, BIM–TF#1, BIM–TF#5, and vehicle of BIM–TF#5 diluted to a concentration equivalent to that of 5 μM BIM, and minoxidil in ethanol diluted to a concentration equivalent to that of 10 µM minoxidil. (C) Time–course curve of relative scratch wound recovery area of hDP cells. **p<.01, ***p<.001 compared to control (untreated); ###p<.001 compared to vehicle (BIM–TF#5); $p<.05, $$$p<.001 compared to BIM in ethanol (5 µM); &&p<.01, &&&p<.001 compared to BIM–TF#1 (5 µM); @@p<.01 compared to BIM–TF#5 (5 µM). Values represent means ± SDs (n = 6). (D) Representative microscope images of scratch wounds of hDP cells. Scale bar = 200 µm.