Your Surgeon is right,telling you that this is normal,but if he/she did not examine the
lump,then you should have it checked out,particularly if the
lump is increasing in size or show signs of redness or irritation that could indicate an infection.
If your surgeon,after examining you, thinks you are healing well,then try not to worry.... Eventually the hardness will soften and the lump will reabsorb.Be patient because it could take quite a while to have the lump completely gone.
Best wishes...