It seems from the history you have provided that you have recurring cyst
in the operated conjucntival site following squint
This is probably suture related granuloma
or cyst of the conjunctiva
because of retention of the fluids.
The treatment is by antiinflammatory drugs and most of the times surgery is required to excise the cyst. This may be recurring if you have scar forming tendency called as keloid formation in other parts of the body.
Kindly enquire regarding this during your next visit to your eye doctor. The main treatment of your condition as I told is by surgical excision and use of appropriate antiinflammatory drugs.