Thanks for posting your query at DoctorSpring.com
I checked the picture and its a very deep wound, I would recommend that you visit your doctor as soon as possible so he can take the stitches for you.
It wouldn't be wise to leave it alone to heal by itself as it will surely attract bacteria which will cause infection.
Also it won't break up easily and completely as its a very deep wound.
The stitches need to be taken under strict aseptic precautions by a doctor so as to prevent non healing of the wound.
I hope this has helped. Feel free to follow up.