painful swelling on rt side of chest

im 42y/o male i have large knot on rt side of my chest and now under my arm pit it is very painfull at times and a wierd looking mole there also been there 3 months and just slower increasing what could this be

[Cleveland Clinic]

Dear krazygman:  Without evaluation, it is impossible for us to speculate on what this might be.  In general, in the setting of a new or growing lump, further evaluation is recommended.  We recommend that you show this to your doctor.