Itchy and swollen eyelid of eyelash extensions may be caused by allergy, conjunctivitis or blepharitis, which can be solved by using symptomatic drugs according to different situations. 1. Allergy: some patients have obvious allergic reaction to the chemical glue and biological glue of the inoculation, which will cause irritation to the eye skin and itchy and swollen eyelid eyelashes. You can use anti-allergy eye drops or anti-allergy eye ointment, such as azelastine eye drops, orotidine eye drops, etc. for treatment, which can effectively relieve the symptoms. 2. Conjunctivitis: If you use unhygienic instruments, it will cause pathogenic bacteria to breed around the eyes, leading to local infection and eyelid itching and swelling of eyelash extensions. Medications such as levofloxacin hydrochloride eye drops can be used to relieve symptoms. 3. blepharitis: may be due to the eyelash extensions in the use of glue is not up to standard, or the skin around the eye is not in place to clean, resulting in skin irritation around the eye, induced blepharitis, eyelid extensions eyelid itchy and swollen. Medications such as tobramycin dexamethasone eye ointment can be used to relieve symptoms. If you have eyelash extensions that are itchy and swollen, it is recommended that you seek medical attention in a timely manner to identify the cause of the problem with the help of your doctor, and to carry out targeted treatment or therapy. During the treatment, pay attention to the local cleanliness of the eyes, so as to avoid re-infection, which is not conducive to the recovery of the condition.