I am sorry to hear about the complication you are experiencing. These types of complications can be quite distressing to patients; unfortunately, sometimes the wounds do look worse before they begin to look better.
Close follow up with your plastic surgeon will be in your best interests; sometimes removal of a exposed suture and/or removal of any unhealthy tissue will expedite healing.
Wound care regimens will differ from one plastic surgeon to another. Generally, this will involve application of some type of sterile dressing ( in my practice I use a non-stick dressing covered by a sterile dressing). You should have peace of mind that these types of wound healing problems generally go on to heal over the course of the next several weeks, often without long-term sequelae. Sometimes (depending on the width of the open wound and the appearance of the scar in the longer term), scar revision surgery may be helpful down the line.
Also important to concentrate on a healthy diet, including good protein source. Best to "occupy your mind" yourself with activities that you enjoy; wound healing can be slow and potentially frustrating to patients. Best wishes.