iPhone camera purple dots

Just today I went to snapchat and found that there was purple dots on my screen, thought it was something stuck to the outside of the rear camera but I cleaned it and it's still there, went onto my actual camera and there is actually 2 there not just the one

I saw someone asked this before and the reply was take it to the apple store as it had happened to a few others who then got a replacement, but as my phone is out of warranty now, I don't think I'll get a replacement

What should I do as I don't really like the idea of paying about £250 for a refurbished phone but also don't want to use a camera that has noticeable purple dots