These are hidrocystomas, or if you want to be more eponymous, cysts of Moll (here he is – an anatomist from Utrecht in the 1800’s! A poor picture but at least it shows he wore a bowtie!!) They are cysts derived from apocrine sebaceous glands to be morte precise and need to be removed with sharp knife surgery, which we did with difficulty. When I have the histopath back I’ll pop it onto the website here! There is a recent paper on these – Cantaloube et al 2004 Multiple eyelid apocrine hidrocystomas in two Persian cats. Veterinary Ophthalmology 7(2):121-5 but their cysts didn’t look quite as spectacular as this one to my mind!