Is it normal to get a hard lump under the incision after an operation? (photo)

Thank you for sharing your question.  Unfortunately without feeling the tissues it is difficult to offer definite advice but in general the skin will develop swelling and scar tissue during the healing process that can feel firm to the touch. I would allow your results to mature for a few months and then revisit the hard lump to see if it has resolved spontaneously.  Hope this helps.