Thanks for your question. Firstly, let me remind you that all pain killer drugs are processed and metabolized in the liver. A long term use of them may cause a certain amount of liver damage too. But the risk depends on existing liver diseases, use of alcohol, dosage of medication you take etc. As you told, the hepatic cyst in your liver is very small in size. No medication is required to remove this unless any symptoms are seen. So, it is better to wait for any ill effects and if anything occurs so, you should consult with your doctor. Good luck.