How does hydroquinone turn skin darker and cause hyperpigmentation?

NONE OF YOUR BUSINESS: How does hydroquinone turn skin darker and cause hyperpigmentation?
If hydroquinone blocks cells from making pigment then how can it sometimes have the bad effect of making the skin overall darker and hyperpigment? Hydroquinone is supposed to make skin lighter but I read that is can also make skin darker as a side effect and also cause hyperpigmentation? But how does it do this? I mean what is the reasoning behind this bad side effect?

Answers and Views:

Answer by Maria
probably bc you need to use sunblock while wearing it and some people wont. so itll turn the skin dark, from sun expsosure while on the product..