It is an acute purulent inflammation of the sebaceous glands near the eyelash follicles of the eyelids, or of the lid glands on the conjunctival surface of the eyelids (medial side). 1. External wheals: Initially, there is limited congestion and swelling at the lid margin, and after 2-3 days, a hard node forms, with obvious pain and pressure. 2. Internal mydriasis: The symptoms are roughly the same as those of external mydriasis, except that the inflammation is more severe. It is difficult to get better on its own and usually requires incision to drain the pus. Mets are treated with antibiotics, including topical antibiotic drops/ointment for frequent eye dabbing and oral antibiotics for severe cases. For external mydriasis, hot compresses can be applied in the early stage to promote blood circulation and relieve symptoms. If the abscess forms and does not break down or if the pus does not flow out after breaking down, both require surgical incision and drainage at the hospital. Remember not to squeeze yourself to avoid spreading the infection. Since internal mydriasis often recurs, patients need to be careful to avoid excessive eye use on a daily basis, pay attention to eye hygiene, and also eat less spicy and stimulating foods. Those with blepharitis, blepharoplasty, or blephar gland obstruction or blepharoplasty dysfunction should adhere to treatment for such diseases.