Painful Lump in Armpit: 3 Things that You Should Do if You Find a Lump in Your Armpit Last Updated: November 3, 2020 by Health Beauty Idea Team - 4 minutes read If you ever find a painful lump in armpit, then you need to know what you should do. A lump in your armpit can be caused by several different things. Here are The Things that You Should Do if You Find a Lump in Your Armpit