Wound dehiscence: when can I stop being worried my wounds will separate?

 The wound dehiscence you're describing requires patience but the skin most always comes together just fine without further complications or infection.   Be sure to keep the area clean, dry and covered.  When the incision is well, paper tape along the incision is helpful with keeping the scar line flat and secure during the next phase of healing.  The small pustule you've noticed under the right breast could be a small internal stitch that never dissolved.  These usually work their way out without any problems.  Be sure to follow up with your surgeons advice and keep all post operative appointments.