How do I apply hydroquinone on my face? (photo)

Hi there. I’ve been using hydroquinone on my dark spots for 2 days as prescribed by my dermatologist. However, I applied it over my entire face and it has now left dark patches on my skin. My face is also very red. I am an Indian with a medium skin tone. I am not sure if I should continue using it or not? And any advice on how I should treat the burns caused by the hydroquinone?