I had a mole removed last week on my shoulder, how do I tell if my stitches are infected? (photo)

Last week I had a mole removed on my right shoulder to test for malenoma skin cancer. My doctor told me to keep it covered and apply vasaline to it when I change the bandage so that's what I have been doing now it has orange crusty stuff around it and it is very itchy I'm trying to figure out if it is normal or infected.

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