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Basal cell carcinoma is the most common type of skin cancer, but also the most curable form. It's considered highly treatable, especially when caught early. It is a slow-growing cancer that usually is confined to the surface of skin — doctors almost always can remove it all with a shallow incision — and seldom causes serious complications or becomes life-threatening.

The Bidens spent the day at Walter Reed ºÃÉ«tv Military Medical Center in Bethesda, Maryland, where the 71-year-old first lady underwent a common outpatient procedure known as to remove and examine the lesions. After nearly nine hours at the hospital, the president returned to the White House solo; the first lady was expected to follow later in the evening.

O'Connor said she was “experiencing some facial swelling and bruising, but was "in good spirits and is feeling well."

Basal cell carcinoma is so common there aren’t good counts. The lumps them in with another easily treated type called squamous cell cancers. About 3.3 million Americans get one of those two types each year and the vast majority are basal cell, according to the organization.

The first lady's office announced a week ago, through a Jan. 4 memo from O'Connor, that doctors had discovered during a recent routine skin cancer screening. The lesions removed from her chest and left eyelid were discovered on Wednesday.

The Mohs surgery involves cutting away thin layers of skin and examining each layer for signs of cancer. Doctors keep removing and examining layers of skin until there are no signs of cancer.

Doctors recommended removing the lesion from above Jill Biden's right eye “in an abundance of caution,� O'Connor wrote in the memo.

The said the delicate skin around the eyes is especially vulnerable to damage from the sun's ultraviolet rays. Sun exposure is the main risk for basal cell carcinoma.

Jill Biden had the procedure the morning after she and the president returned from Mexico City, where he held with the leaders of Mexico and Canada, and she kept a separate schedule of meetings with women, children and her counterparts from both countries.

Biden accompanied the first lady to the hospital, as he has done for some of her past medical appointments since he became president.

“Today is about his wife, that is the focus for the president right now,� White House press secretary Karine Jean-Pierre said when asked about Biden's activities at the hospital while doctors cared for the first lady. “This is about the president supporting his wife of 45 years.�

Biden accompanied his wife to an outpatient center near the campus of George Washington University in April 2021 for the White House described only as “common.�

He also went with her to Walter Reed in July 2021 for outpatient treatment after she while walking on a beach in Hawaii. She had stopped there on her way back to Washington from the Tokyo Olympics.

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AP Medical Writer Lauran Neergaard and AP White House Correspondent Zeke Miller contributed to this report.