Crater in my nipple. Any help? (Photo)

It's still soon in your recovery from gynecomastia surgery. As you heal, the area may feel “lumpy” and irregular. This, too, decreases with time, and massaging these areas will help soften the scar tissue. The #compression garment helps reduce the swelling, and the longer it is worn, the more quickly you will #heal. It can also assist in the retraction of the skin. 

In the future, if you are still experiencing your crater concern, its best to ask questions of your surgeon or their nursing staff.  They may possibly be able to address the issue with fat grafting or cosmetic fillers if you are a good fit.

Hello,I recommend that you follow up with your Plastic Surgeon to ensure any infection has cleared. As your scars mature throughout the first year the appearance of irregularities like this should minimize quite a lot. Talk with your Plastic Surgeon about scar treatment options.All the best

Thank you for the photo.  You are encountering a small dehiscence.  This is not uncommon.  There are many factors into play when it comes to healing after surgery.  You should be certain to follow up with your surgeon.  This will heal.  The scar can be revised down the road.