Henna eyebrows not taking?

[Maria_therapist]

Hey,

I have been doing henna eyebrows for a few months now with great results, but have recently had a few clients with missing patches of hair in their brows.

I assumed henna would fill in these patches as is has been taking to the skin quite well, but it just hasn't been in these hairless patches. Help!

I have tried both salon spa henna and Irena Levchuk henna.

Thanks