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what are the large itchy very painful bumps on a squishy scalp

These bumps start up like tiny itchy pimples and are very painful when I touch them.  Then they ooze a little pus with a watery liquid.. Then they scab over.  When the scab comes off (usually with my help), a hole remains.  They are in my hair from forehead hair line back.  Scalp feels spongy. Two or three scabs were yellowish green.  A couple of months ago I had a few just like that on my arm.  
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I am not sure, but I have similar happen whenever I ingest canola or any food with a similar low-(machine)grade oil. Palm, "vegetable", rapeseed and domesticated animal fats cause similar to myself. I hope this info can somehow help someone.
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