I've been processing a bird here and there for a couple months now - Cornish X and RIR roos. Something I've been noticing is almost every bird will have several big blackhead-things, especially on the thighs. They're not feather quills. It's kind of gross but if I squeeze them an almost clear (bit orange) liquid oozes out. I haven't noticed anything weird in the taste and usually cook skinless anyways but I'm wondering if anyone else sees this. And if so, do you know what it is and is there an easy way to get rid of them rather than squeeze them all out?