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To relate my own experience with this exact same symptom - swelling under his neck area on my 9 month old Panther - I immediately stopped all supplements including calcium for 2 weeks. Within a week the small swelling much like you posted initially was completely gone. I resumed his dusting schedule but instead of dusting calcium at every meal, I dust about every second meal and cut back on his D3 to once every 3 weeks and his Multivitamin every 3 weeks as well.
This seems to have fixed the problem in my chameleon so far.