Lead Acetate in Hair Dye

I have been utilising a progressive hair colouring agent to gradually eliminate my grey. The product contains lead acetate would this chemical result in hair loss. I am 40 years old, male, and just today noticed a tiny bald spot on my crown. I have been using the colouring product for only 4 months and worry it has resulted in permanent hair loss.

I would imagine that the use of lead acetate must be safe in the products that use it or there would be a real problem considering its use in many of the hair dyes. I can not comfortably comment on this query. I did find this article from a year ago about lead acetate in hair dyes being banned in Canada — CosmeticMagazine.com.