Reddish Spot On Face

It all started when I was in my 20's I had a pimple but it was the under the skin type, so foolishly I put a bandaid on it and it left this circular red mark under my lip, it goes away I find when the weather is warm, in the winter forget it, it shows up real bad. Even when I eat, it goes to a reddish circular, ive never been to a doctor about this but know at the age of 28 it's still there. I am not sure if someone is going through or has the same thing. Let me know if you could help. Thanks