I think my cat has pus on its neck, but it's not an open wound. How do i take it out?

My cat has has a bump in between his eye and ear and it was full of pus. We drained the wound of pus once, every other day. Now, he has a lump on his neck. We're thinking the pus went to his neck. We were thinking of shaving the part of his neck and poking a hole to drain it out. Is that a good idea? What can the lump be?
I don't have the money to go to the vet. We went to the vet once and the doctor checked him, but the doctor missed an infection it had. So we had to heal him ourselves.
The wound in between the ear and eye had a scab. you take off the scab and take the pus out. You're suppose to do that.
 
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