Had a lipoma operated from left flank 6 weeks ago. I now have pain and a burning sensation. Do I have an infection? (photo)

Had a 5 cm lipoma on left flank growing slowly. After a normal fnac surgeon operated it on 2nd June .and discharged me after the night . No drainage was there. now there is a tiny abcess on the cut. And there is pain as if it is done only yesterday. The pain is not much but drawing concentration all the time. The pain is like some needle going inside all the time. After this one and half month why should there be light pain on touch or light rubbing?