Extramammary Paget’s disease (EMPD) is a rare malignant neoplasm of the apocrine sweat gland-bearing skin in the genital, perianal, or axillary region. EMPD may simultaneously occur in the genital and both sides of the axillae, termed as “triple EMPD,” which was first reported by Kawatsu and Miki in 1971. Since its first description, 28 Japanese and only 4 Caucasian cases of triple EMPD have been reported. Here, we present the first Korean case of triple EMPD in the groin and bilateral axillae in a 46-year-old female patient whose axillary lesions appeared consistent with seborrheic keratosis. This case emphasizes the need to consider EMPD in differential diagnosis when evaluating acanthotic axillary lesions since it can mimic benign lesions. (Korean J Dermatol 2020;58(1):55∼58)