Hi, welcome to the ehealth forum and I am glad to help you.
You seem concerned by the boil in left armpit that had burst 2 days back and now having a small lump, rubbery to feel but a little paiful. You have also made a mention of mild enlargement of liver on ultrasound with altered echopattern and drinking pattern on higher side for the last 2-3 years.
You might be having alcohol induced enlargement of liver due to heavy intake of alcohol and stopping the same can reverse the changes in the liver. About the boil being painful and of short duration, it might be due to infection and treatment with antibiotics might help your cause and if the lump is not resolved then your doctor might consider further testing such as fine needle aspiration cytology to get an idea about the nature of lump.
You must keep in touch with your personal physician for definitive diagnosis and management as the same is not possible online.
Hope this helps. Take care.
Note: This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.