His work concerns "social issues and topics related to identity, environment, migration and macroscopic human transitions.
"[4] Mollica creates self assigned series—his book Terra Nostra (2017) is about the permanent scars left behind by the Sicilian Mafia—and works on documentary and photojournalism commissions for magazines and NGOs, and mentoring photographers.
His work has also been shown in various group exhibitions and been included in survey publications on street photography.
[10] From 2009 he spent seven years working on his book about the permanent scars left behind by the Sicilian Mafia,[2][5][11] Terra Nostra (2017).
[12] The book was well received by critics[13]—Gerry Badger said its photographs "are eloquent and poetic, and in an era where so much photography is trite and shallow, dense enough to feed both mind and eye";[14] and Sean O'Hagan, writing in The Guardian, said "it is a work that repays close attention [...] a deft merging of the quotidian and the unsettling".