I found the following article on Pubmed (PMID 18605528):
Dermatitis artefacta of the lip in an adolescent.
Collard MM, Hunter ML, Motley RJ, Lewis MA.Dent Update. 2008 Jun;35(5):339-40, 343.
They describe some features typical to EC, and they report a referral of the patient to an adolescent phychiatrist. Maybe we can learn something from this? Anyone found other interesting scientific reports?