Have I damaged nerves?
 

About a month ago I SI'ed on the top of my wrist, about 6 pretty deep cuts, they didn't split wide but they were kind of deep
(I could see fat or somthing underneath skin)

When I cut my index finger and the fingers at either side went a bit numb
and for a few hours afterwards I had pins and needles in my hand.

Now the cuts have healed and I just have some scars but I've noticed lately that this area of skin is kind of numb.
Whatever I do to it (if I cut it again) or if I scratch it on somthing I don't really feel anything.
It's not completely numb but if I pinch the top of my wrist really hard I can't really feel it
and when I'm scratching this area (I get itchy scars!) I have to scratch really hard to even feel the scratches,

I'm not making much sense, but basically just worried about how numb this area is, have I damaged nerves or somthing?
Will this ever go away or if I have damaged nerves is it permanant?

Can you move your hand fine? Is it just the scarred area/the scars that are numb? Have you no longer got pins and needles?

Scar tissue aint as good as normal skin tissue. Less nerve supply, less blood supply, no hair folicals will grow etc. Normal for the actual scar tissue to feel numb/tingly. Also scar tissue can grow larger in size than the origonal skin and may put pressue on surrounding nerve tissue causing surrounding area to tingle. As long as you can move and feel your fingers without pain or strange sensation i'd reckon you'll be ok. Oh and by the way scar tisue is also less resistant to UV light - just incase you were thinking of sun bathing.

Since deep scar tissue doesn't have any nerves in it, it won't feel like anything, however, there are different layers of nerves, so depending on how deep the scar tissue goes you may or may not have some degree of feeling. For example if you have a very shallow scar you may not have any sensory problems with the scar. If it's medium you man not be able to feel heat or sharp, but you could feel pressure etc.

In many cases, unless a scar is large, any sensory problems at all will be hard to determine because the skin/hair around the scar will also be stimulated, so you will still feel things.

When you say your index finger and either finger to the side of it are numb, you are talking about your thumb and middle finger correct?

Anatomically that area is fed by the same sensory (feeling) nerves, and if it is numb, it is likely that you did some nerve damage when you SIed. If this is the case it is unlikely that you will regain sensory perception in the area, and if you do at all it will be over a very long period of time.

the fingers on my hand aren't numb anymore, just when I SI'd in the first place
but I think the scar tissue is pretty deep or somthing as its definatly a numb area and I don't really feel much there

Yeah, as Aidey said, it will just be because the scar tissue doesn't have nerves within it. There may also be some degree of nerve damage too. Over time hopefully some nerve tissues will grow into the scar tissue but this may not happen as nerves have a limited amount of regeneration/growth. You've just got to hope for the best but if you can feel nothing on the scar at all, even hard pressure/pinching on it you are unlikely to get fully feeling back.