Regarding chalazion all are true, EXCEPT:
A chalazion or tarsal or meibomian cyst is a chronic non-infective granulomatous inflammation of the meibomian gland. Incision and curettage is the conventional and effective treatment for chalazion. The incision made should be veical on the conjuctival side (to avoid injury to other meibomian ducts) and horizontal on skin side (to have an invisible scar). Note: To avoid recurrence, its cavity should be cauterised with carbolic acid. Ref: Ophthalmology by A K Khurana, 4th edition, Page 346, 347
Veical incision given to squeeze out contents
Horizontal incision to be made to squeeze out contents
Incision and curettage done
It's a granulomatous condition