Worried about symptoms

For a while, I've had a lump in my pelvic region, I thought nothing of it and didn't bother making an appointment but lately I feel very tired, coughing and out of breath (not covid, done tests on that for a week lol) and the lump seems to be a bit bigger, it's also firm and immoveable. I know it's probably nothing to be worried about but since I have a suspected growth in my shoulder, I'm fairly worried. Any advice would be great :happy: