Hi Dr, I ve had a lump on my back for about a year now. Last year my doctor diagnosed it as a benign lipoma. Within the past month though, it has nearly doubled in size, is extremely sensitive/painful and red, and instead of being firm to the touch, it is squishy and boyount. Occasionally it gives off a foul odor. I m a heathy man in my early 20 s. Any ideas of what s going on?