Can gynaecomastia regrow? Is there any change of leftover of gynaecomastia tissues after surgery? (photo)

It is possible but unlikely for the leftover breast tissue to be regrowing, assuming you aren't on certain medications.  It is more likely that there is some scarring or induration that you are feeling more now that the inital swelling is down.  This should be followed closely so make sure you are seen by your surgeon so it can be checked.  

Gynecomastia refers to male breast development. It is important to understand the components of the breast (male or female): glandular tissue and fat. Each of these are addressed, to a certain extent during surgery. However, there are always post operative variations/asymmetries. There can be glandular persistence as well as fat excess amenable to revision. Additionally, there can be recurrence as any persistent glandular tissue will be responsive to hormonal variations (intrinsic or exogenous) and residual fat will fluctuate with weight.Based upon your photos, you demonstrate a reasonable improvement with some asymmetry. This may be addressed by revisionary surgery (either liposuction or direct excision).As always, discuss your concerns with a board certified plastic surgeon (ABPS).

since you mention that you were perfectly flat after surgery, it is most likely scar tissue. Remember you are going to be your own worst critic. if the surgeon goes back in to remove it, there is a good chance that you may just regrow new scar tissue. I would suggest waiting a full year, before contemplating revisionary surgery. it may be best to accept what improvement you have obtained and accept small imperfections.david berman md