Patients with red, swollen and itchy eyelids after applying makeup may be caused by contact dermatitis, blepharitis and blepharitis. 1. Contact dermatitis: If the cosmetics are irregular or belong to the allergy-prone body itself, the patient’s use may lead to eyelid skin allergy. Due to the constant stimulation of the skin surface, contact dermatitis can be triggered, resulting in patients with eyelid redness, swelling, itching and other uncomfortable symptoms. 2. Blepharitis: If you don’t pay attention to cleaning your hands before applying makeup, and if you touch your eyelids with dirty hands during the process of drawing eyeliner and eye shadow, it can lead to bacterial and viral invasion of the eyes, which can lead to blepharitis. Due to the inflammation stimulation, the patient may continue to eyelid redness, swelling, itching and other discomfort symptoms, the patient may also appear eye photophobia, tearing and other discomfort symptoms. 3. Blepharitis: If you use a lot of cosmetics such as mascara for a long time or spend too much time in the eyes, it may cause the sebaceous gland ducts around the eyelids to secrete too much oil, which triggers a pathogenic bacterial infection and leads to blepharitis, and the patient may experience redness and swelling of the eyelids and itchy and other uncomfortable symptoms. It is recommended that patients with red, swollen and itchy eyelids after applying make-up should consult a doctor for a clear diagnosis and follow the doctor’s instructions to choose the appropriate treatment.