The R lobe is normal in size, the left is smaller -- this is not pathologic. The cyst on the left is small and does not require biopsy. It is possible the lump is not the asymmetric thyroid as the R lobe size is normal -- unless you have a high-lying thyroid (ie, higher in the neck) that makes it more prominent, If very concerned, an ENT evaluation may be helpful. The duration of 7 years is re-assuring that it is a benign lump.