I have two pimples on the back of my neck and have for about the last month or so. I popped them both when they got big enough but it must not have completely drained of pus and it is still there and is very dry and very hard. The one is more of an elevated bump that has dry skin surrounding it and it does not respond to any acne medication. It hasn't merely dried up and gone away. Neither of the really hurt or anything. I've tried a warm compress but not for long...what should I do? It always seems pimples towards the back of the neck are stubborn.