Red, swollen and painful eyes after eyelash extensions can be caused by several reasons: First, eye infections can be caused by unhygienic eyelash extensions. If your eyes are filled with fluid and the whites of your eyes are congested, it is likely to be caused by a bacterial infection. Consider using anti-inflammatory eye drops, such as Tobex eye drops, or oxyfloxacin eye drops or chloramphenicol eye drops, six times a day. Usually it will take about a week to relieve the symptoms of eye redness and pain, and the eye discharge will be reduced. Second, if there is only redness and swelling of the skin at the eyelid margin and there is pain and itching, with increased scaling-like material and shedding, it may be scaling blepharitis. Consider using hormonal as well as anti-inflammatory eye drops for treatment, for example, you can use tobramycin dexamethasone eye drops for treatment, four times a day, which will usually relieve the symptoms in about a week. Removing eyelash extensions and reducing the use of eye and intraocular eyelid margin cosmetics to reduce eye irritation is recommended and can significantly relieve symptoms.