Sunscreen for acne-prone skin

I go to the dermatologist frequently, but only when I have a sudden, severe breakout. However, I saw on YouTube that applying sunscreen is especially important for acne-prone skin, so I diligently applied it based on that, only to have it get worse. The dermatologist also told me not to wear sunscreen or makeup until my skin improves. I think wearing a hat is actually better for blocking UV rays than applying anything to my face.