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Tanaka et al. Plast Aesthet Res 2020;7:17 I http://dx.doi.org/10.20517/2347-9264.2020.12 Page 5 of 10

A B

D
C

F

E

Figure 2. Open excision procedures: A: the incision plan according to Rigg [22] ; B: a small elliptical sliver of skin is removed, and the
apocrine glands lined above the fascia are seen; C: after the subdermal layer of the axilla is undermined, the apocrine gland layer is
seen; D: the apocrine gland layer is completely pruned, leaving the sebaceous glands; E: the wound is closed by 5/0 nylon sutures; two
quilting sutures were made in this case. A drainage tube is inserted from the lower edge of incision wound; F: six-month postoperative
photograph

Statistical analysis
The mean ages of the two patient groups were compared by the Mann-Whitney U-test. Other categorical
variables were compared by the chi-squared test. When the expected values were too small to be analyzed
by the chi-squared test, the Fisher exact test or Yates continuity correction was used for the comparison.
Statistical analysis was performed by Microsoft Excel 2010 (Microsoft, Redmond, WA, USA). P < 0.05 was
considered statistically significant.