Did a blocked sweat gland cause this?
HERE is a small, clear fluid-filled sac on the lower eyelid.
At this level it looks like a cystic basal cell carcinoma but it was soft and easily compressible. This is an eccrine hidrocystoma, probably derived from obstruction of a sweat gland.
The other lesion that can present like this is an apocrine hidrocystoma, but it is more closely associated with the eyelash follicle and the cyst has a bluish colour.
A simple way of dealing with this swelling is just to take a cutting needle and open it and drain it.
Sometimes the cyst walls adhere and it does not recur.