Aro face damage

#1
Hi all. I noticed some loose skin hanging on my aro's face today and upon closer inspection, i noticed that a few spots on it's face is missing the shiny covering and the flesh is showing.Can somebody please tell me what this is and what may have cause it? The aro is around 12 inches and the tankmates are stingrays ranging from 12-14. Thanks in advance
 

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