Hi,
It seems that you have a muscular injury in the chest. Rest, icepacks and OTC painkillers which will reduce pain and swelling will help. If the pain persists please get yourself examined by a doctor as you may need to undergo a chest X ray.
Hi,
Did you get any injuries whilst working in the garden? Did you notice this area of tenderness recently or was it there at the time of the initial pain?
It appears that you may have had a muscle pull or a small fracture of the ribs. This may be caused by sudden increase in the muscular pull due to sudden weight bearing.
You must get this examined by your doctor and probably get an X ray done to rule out a fracture. It is essential for you to reduce the weight bearing on the either side of the injury. You may also use some pain killers and local pain ointment as well as fomentation to help you with the pain. The lump may also need some examination.
Please let us know what the doctor said and if you may have any queries/questions.
best regards