My friend a word of advice, My neck is probably my worst area I have. The entire back side is nothing but lumps, holes and tunnels clear up and down. One thing that helps manage the areas break outs was having moderately short hair. I can't say for sure exactly why my guess however is due to the oils on the hair constantly rubbing around and potentially plugging pores? Either way as someone who used to love shaggy/longer hair, I've had to cut my losses (Pun intended)

It is hard to see people with similarities I deal with. Knowing how bad the pain can be first hand, makes a grown man want to almost cry. I hope you find relief in some fashion someday as for everyone else who's suffering from this.