I have suffered corneal abrasion without any physical contact with a finger or blade. it recurs after a month of total abstinence, how does this occur?

See answer: Any defect in the corneal surface epithelium is termed a "corneal epithelial defect"(CED). When it occurs due to mechanical trauma the CED is termed a "corneal abrasion". Once the cornea has sustained an abrasion and subsequently healed, it is prone to develop a SPONTANEOUS reoccurrence of the CED which the ophthalmologist may term an "abrasion", as it is a more familiar term to the patient.