Small-medium sized clearish dark spot while I try to take a photo whether it’s using the camera app or another app that uses a camera

Hi, is there anyway you can help me? Today I noticed this gray spot appear whenever I tried taking a picture. The last picture(one that isn’t with the vent or light in it) is mine. I looked it up to see if I can try to fix it(that’s when I came across the first picture, one with vent and light in it) because someone had the same problem. I saw that Apple suggested to restart the phone, I tried that and it didn’t work. Is there anyway I can try to fix it without bringing it in? If I can’t, I’ll obviously bring it in.