So, I have several lumps on my body, and three of them were ultra sounded by a doctor and examined externally by a dermatologist. All of the results stated that these were probably lipomas and nothing to worry about. This being said, I decided to try and shine a light through the larger one on my left flank, and it wasn't transparent. I know that non-transparent lumps in testicles are a problem, but can lipomas be non-transparent?