Tips for other sleeping positions?

Here's the problem: Whenever I wake up in the morning, I lie on my side with my face resting on my arm. As a result, a kind of acne has developed on the side of my face where I'm lying. Probably because the skin there can't breathe when I'm lying on my arm.

I usually have really clear skin, it's really just the area where I lie on it that hurts a lot and is inflamed, but I don't notice it when I sleep.

I've tried side-sleeping pillows with silk covers, but I absolutely can't fall asleep on my side. I always fall asleep on my back and then roll over during the night so I'm lying on my side with my arm resting on it. When I wake up in the night, I roll over again, but I always wake up in the same position.

Does anyone have any tips on what I can do about it?