I have hard lump at the base of my thumb where it meets my palm, the tendon that goes up the side of my thumb is sore as well. It happe luned over the past few months, originally my thumb joint would catch the lump appeared after the catching improved.
Hi, thanks for sharing your health concerns with Chat Doctor!  If I were your treating Doctor for this case of painful thumb swelling, I would consider some infective pathology like tendinitis/bursitis or infected inclusion cyst! This one needs antibiotic therapy and sometimes incision / excision for cure!Therefore, you need examination by a surgeon. Hope this answers your question. If you have additional questions or follow-up questions then please do not hesitate in writing to us. I will be happy to answer your questions. Wishing you good health.