Well, having had a friend or two i'm usually the one giving them advice in regards to cutting. However, i'm slightly baffled with my own, so i thought i'd ask here.

On thursday before i went to my usual 2 week doctors check up, i had a turn for the worse, and cut my right arm. Now, having only ever done surface wounds before (I've never felt the need to go "deep") i've never had a reason to worry.
Having lifted my sleeve ever so slightly to show him, he agreed the wound was superficial. However, on closer inspection when i got home and once my jacket was removed, i noticed the upper end of my cut was much deeper than i intended.
The doctor wouldn't have seen this, as the cut measures from the crease in my arm down to my wrist, so he only saw the wrist part which is just a normal surface wound.

Now, i believe it's not deep enough for stitches. It seems to be somewhat healing on its own. As i'm looking at it right now, i see yellow, which i'm presuming is the fat underneath the skin?
My arm actually hurts to bend, and if i didn't put something like Vasaline on it to keep it moist, it just feels like it will split open. It feels like i'm being stabbed everytime i touch it.
Could it be that i've damaged a muscle? Or could it be an infection?
I have trouble getting out of the house, so i don't want to go down the doctors unless its really necessary.

Should i wait a few days to see how it goes? It's red around the actual wound, but that could just be from "soreness".
I can never tell if it's actually oozing a bit of puss, or whether its from the healing process.
Hm. I'm slightly clueless.

I hope i explained that properly.

Thanks in advance.