In the link below is an article about 5 women who developed regression (retraction) of the frontal hairline after botox (high brow) treatments.
They all complained of advanced recession of the hairline after periodic injections of botulinum toxin type A into the forehead. An observational study was therefore conducted on them.
The women had a mean age of 52.7 years (range 45-58) and had undergone periodic botox injections against forehead wrinkles 1-10 years ago (average 2.6). The frequency of injections ranged from 4 to 6 months. The women came from both private and institutional clinics.
Alopecia (hair loss) of the frontal hairline was evident in all 5 patients, and a misscopic examination of the head hairs showed that the hairs had also become thinner. The average distance between the hairline and glabella (gap between the eyebrows) was more than 6 cm.
Dermatologists should be aware of the possible occurrence of frontal alopecia following repeated injections of botulinum toxin type A into forehead wrinkles. Skin and hair problems have not previously been reported as side effects for botox.
The study with pictures can be seen here: