Hello, please don't consider any swelling on your body to be a cancer. Lipoma is not a cancer also, I think you very well know that already.
Regarding the swelling what you have on neck, we need to evaluate it. Consult a ENT specialist online, you will be provided medications for 5 to 7 days first.
If swelling doesn't subside, you will be asked for USG and FNAC test.
Please don't panic.
Next Steps
Consult ENT specialist online.