Incision reopening after breast augmentation 1 month ago - should I be worried? (Photo)

Here are my wound care instructions which will help you avoid infectionDo not do anything that requires you to bend, strain, lift, or cause exertion until sutures are removed or otherwise directed. No strenuous exercise until after your sutures are removed or otherwise directed.
IF BLEEDING STARTS, apply continuous firm pressure on the area for 30 minutes without removing the bandage. If bleeding persists hold continuous firm pressure for an additional 30 minutes. If the bandage becomes saturated it may be replaced. If bleeding does not resolve after 1 hour please call the office or page the physician on-call.
TO PREVENT SWELLING: Apply frozen gel-pack every 2 hours for 20 minutes at a time for the rest of the day.
DO NOT WEAR ANY BRAS, OR SURGICAL BREAST GARMENTS. If wearing abdominal binder or any compression garments, cut the front so it does not touch any part of your breasts.
Sleep with 2-3 pillows and on the unaffected side for the first few nights as this helps to minimize swelling.
No alcohol
FOR PAIN: Take 1-2 Extra Strength Tylenol (or the prescription pain medication provided) every 6 hours as needed.
WOUND CARE SUPPLIES NEEDED:
Hydrogen peroxide (Mix with water to form a 50/50 mixture)
Q-tips
2x2 or 4x4 sterile gauze pads
Non-stick gauze pads brand name: Telfa or Band-Aids (if the site is small)
Vaseline ointment (Buy a new jar or tube)
Paper tape (brand name: Micropore)
Ice Packs, or frozen gel packs
Change the dressing daily using the following steps:
Wash hands before and after each dressing change.
Remove old bandage. You may want to shower with the old dressing on so it is easier to remove.
Wash area gently with sterile gauze pads or Q-tips using hydrogen peroxide/water mixture. Lightly remove any crusting along suture line and around the wound. (We do NOT want a scab to form as this can slow down healing and may increase the chance of infection and scarring).
Dab wound dry with sterile gauze.
Apply Vaseline to keep wound moist for better healing.
Cut a piece of non-stick gauze to size and cover your surgical site. Secure the nonstick gauze with tape. You may use a Band-Aid instead if the wound is small.
Continue daily wound care with hydrogen peroxide/water mixture and Vaseline, until the wound has healed completely.
Once the wound has healed over, regular skin care can resume. 

Hi! Thank you for your question and for your picture. It is not common for a breast augmentation incision to open up one month after the surgical procedure. Good news is that from the picture it doesn't look infected. However, please follow up with your plastic surgeon as soon as possible.  Hope all goes well.

The problem could be as simple as a necessitating suture but this condition needs to be examined by your surgeon. The sooner the better.