Wound on dogs face

I believe a week ago i noticed a lump on my dogs face which was black in color and a very odd shape, I was petting him in the dark and I thought it was dirt so i picked it off not knowing it was some sort of scab. Ever since then the wound has been open and my dog has been acting stranger than usual. There is still some of the black scab around the wound, I did try and wash it with water but im not sure what else i can do to help. 

Hello!  Clean wounds with neat edges might improve beautifully if left alone and kept clean.  However, two things interfere with this process.  The first is infection.  Bacteria can be introduced from the hairs on the outside of the skin touching the inside of the skin; from teeth (bite wounds are always infected) or from objects eg sharp shards or the end of a stick, or the dogs' claws, or whatever has poked into the wound / lump.   If it was an abscess that burst, it would have contained bacteria in the first place, which may not be preventing wound healing (a cyst would be sterile but an abscess is full of bacteria).   The second is whether the edges of the wound are alligned.  Imagine tearing a shape from some material; to repair the hole, more material will be needed to patch the gap, or the edges pulled together in such a way that they can allign.  Skin can repair its own gaps, but it takes a long time, with scabbing involved (and needs to be free of bacteria).  In the picture ahown, the edges don't appear to line up and its possible that there may be infection;  I can see that it is small and surgical repair may not be required, but your vet should be allowed to assess this and medical attention certainly may help a lot.