[JamC]

oh, fuck. ok the biggest organ in/on your body IS your skin (unless you count the alveoli's in your lung). clear fact. it is also the heaviest!
your skin has 3 layers: first the epidermis, then comes the dermis, then subcutis. the epidermis itself has another 5 layers, but i'll try to keep it easy.

in the dermis are the "roots" of yur hairs, sweat glands etc.

in the subcutis is where small blood vessels, fat ect are. nerve for the upper layers and stuff.

scar tissue does not stretch which means, if you get hit in that scar tissue it is more likely to break open. often doc's don't know how to treat "fighter cuts". they should be treated immediatly and you should get more stitches than the average person. if you rip a piece of paper als glue it together at 3 places it won't hold as good as if you glue it together at 12 places.
also, if bone is directly under the skin it is also more likely to open, BUT! the dermis (remember blood vessels) it not as supplied with blood as good and so cuts a easier time to heal.
now to alle the sherdoggers ready to bash. i'm a freaking paramedic and have a nursing dagree so please don't try to bash me and tell me that i don't know my shit, because i fucking do!!!!!!!
TS i hoped i anwered your question. in depends on the place of the cut. scar tissue around the eyes means it will open quciker, fight gets stopped quicker, fighter loses quicker.