Hidrocystoma is a rare benign adnexal cystic lesion originating from sweat glands (eccrine or apocrine). Hidrocystoma occurs predominantly in the head and neck region. Periocular hidrocystomas are relatively uncommon. There is no gender or race predisposition. Spontaneous resolution is rare, especially with large cysts, and successful management usually requires excision with complete removal of the cyst wall.

: A 44-year-old male admitted to our clinic with mobile mass in lower eyelid and conjunctival cystic lesion, which had increased in size over the previous 6 months. All other ophthalmologic findings were within normal limits in both eyes. The mass was exposed by blunt dissection through the lower palpebral conjunctiva. Excision was continued by careful blunt dissection in order to avoid capsule rupture and the cystic mass was removed from the surrounding tissues. The dimensions of the cyst were 8x12x10 mm macroscopically.

Pathological examination revealed a benign cystic mass lined with a single layer of columnar epithelium. Immunohistochemically, the mass did not exhibit ki-67 staining, that was consistent with eccrine hidrocystoma.

: Eccrine Hidrocystoma should be considered in case of painless cystic swelling in periorbital region even though its occurrence is rare. . Hidrocystoma do not recur if total excision is achieved which was done in our case.