Lipoma or anythin serious. Or lymphoma?

Hello, I have bulges in many parts of my body. They were small in size when I was in in the school. But a few have grown in size. And I feel the no. Is increasing. I hv shown it to quite a few doctors but they say its nothing to worry about. But, it worries me a lot because none of the doctors were serious about it they simply say "it's nothing to worry about " and one surgeon said its advisable to surgically remove it only if it's more than 5cms. I searched on net to know more about it, results said Lipoma and lymphoma. I do not feel any pain but there are many such in many areas of my body, around 10 are big in size. I want to know the exact condition. Is it Lipoma or lymphoma??? Really worried.. Please advise!