I'm so concerned please read

Ok I don't think I'm crazy but I noticed this I few days now ! On my  lower belly part on the right side it feels very hard and more swollen and when I lay on my stomach I Can move whatever that thing is up and down like inhale it moves up and exhale it moves down and it feels on the right side I'm. Very scared what it can be I looked it up and several ppl have it too they call it a lump. I'm serious it's bothering me what should I do does anyone else have this ?