Thanks for the query
There are various stages of healing of wound. The classic model of wound healing
is divided into three or four sequential, yet overlapping phases: (1) hemostasis
(2) inflammatory, (3) proliferative and (4) remodeling. Sometimes during the process of healing in the last phase of remodelling there is formation of excess collagen
or fibrous tissue that may feel like a painless lump. However, this process of healing is not only complex but fragile, and susceptible to interruption or failure leading to the formation of non-healing chronic wounds, which must have happened in you friend's case.In your case there is no pain otherwise there could have been chances of abscess, cellulitis
or tendon inflammation
. You can apply antiscar gel like Mederma scar gel or Kelo-cote scar gel once a day and gently massage the area for about 6 weeks and observe for persistence of lump or further increase in size, association with pain and tenderness.
If you notice any of these consult your doctor for proper evaluation.
I hope this answers your query well
Wish you and your family good health