She got spayed a little over 2 weeks ago and we just took the cone off 4 days ago, but something looks wrong. can anybody help? should i put any hydrogen peroxide or anything on it?
You should take her back to the vet. It looks like it is a little infected and she may need an antibiotic. Do NOT use hydrogen peroxide as it is bad for wounds in general. Hydrogen peroxide will actually damage healing skin. Until you can see the vet, clean it with a warm cloth and hold a warm compress to it as often as she will tolerate.
I'm not entirely sure. The area looks puffy to me, but there is not a lot of redness and oozing. Maybe in one spot? By all means, take her in and have it checked. I, personally, think ALL "too close to really call" situation warrant being checked.