You have a liver spot (or spots) commonly caused by medication. While many dermatologists don't attribute some "age" spots to the liver, Dr. Ben Johnson does. You may read about large spots having deeper pigmentation, and that's why it's challenging to treat.
We believe deeper and/or larger pigmentation distinguishes liver spots from age spots. Our research connects the cause of liver spots to medications that can often hurt the liver. View a list of liver-damaging medications here. This damage can show on the skin in the form of inflammation/redness. Once in the sun, they often become brown as the skin creates a protective cloud of melanin to cover them. Liver spots develop because the skin inflammation triggers a protective response of melanin (brown) to cover it. To resolve this, you need to heal the liver damage, otherwise, it requires a lifetime of using skin lighteners.