How common are multiple lipomas? Is there any concern that I can develop any other cancerous illnesses due to these. When I was about 20, I developed a growth under my skin on the back of my left leg. Since I have developed more, and the more started to

Not unusual. Lipoma s are not uncommon. Liposarcomas are less common. Other cancers are generally unrelated!
There . There are a few syndromes associated with multiple lipomas. I would recommend you see a dermatologist for careful history and evaluation and to determine if you are at risk for other findings. However, in the absence of other findings, multiple lipomas are fairly common. There is also a syndrome called dercum's with multiple painful lipomas. Read more about lipomas at the link below. I hope that helps.