A swollen eyebrow may be caused by an infection, irritation from tweezing the eyebrows, or an ingrown eyebrow hair. In addition, a new or infected eyebrow piercing can cause a swollen eyebrow. If the eyebrow piercing causes pain, swelling, bleeding, or drainage, the physician should be called because these symptoms can indicate an infection. If the eyebrow is infected, the physician may remove the piercing and recommend an oral or topical antibiotic. To further relieve symptoms, the piercing may need to close completely.

Other causes of a swollen eyebrow include an allergic reaction to cosmetics or facial products, and injury or trauma to the area. Sometimes, when a new cosmetic, such as an eyebrow pencil or eyeshadow, is used, the individual may experience a swollen eyebrow. Applying ice is generally helpful in bringing the swelling down, however, if ice is ineffective, an over-the-counter anti-inflammatory medication may be used. The doctor should be consulted before taking anti-inflammatory medications, however.

Eyebrow waxing or other means of hair removal can be irritating and contribute to a swollen eyebrow. It is not unusual for these treatments to cause allergic reactions that can lead to facial swelling and swelling of the eyes. If this occurs, the physician should be seen for evaluation and treatment. A skin condition called dermatitis can also cause chronic eyebrow swelling, as well as itching and flaking of the skin. Sometimes, topical steroids are helpful in relieving symptoms of dermatitis and a swollen eyebrow.

When infection is present, one of both of the eyebrows can swell. Ingrown hairs and pimples can sometimes cause a bacterial infection. When infection of the hair follicles of the eyebrows occur, an oral or topical antibiotic may be prescribed. In addition, the person with a swollen eyebrow should refrain from touching or scratching the area and avoid the use of cosmetics, facial washes, and hair-removal products.

Fungal infections can also lead to a swollen eyebrows and can cause the itching, redness, and elevated patches of salmon colored plaques. In addition, loss of eyebrow hairs can occur as well as scarring. Typically, a swollen eyebrow caused by a fungal infection is treated with a topical anti-fungal cream, but occasionally, an oral anti-fungal medication will need to be prescribed. Oral anti-fungal medications, however, can cause nausea, diarrhea, abdominal pain, and vomiting.