5Janecka IP, Wolff M, Crickelair GF, et al. Aggressive histo- logical features of keratoacanthoma [ J ]. J Cutan Pathol, 1977, 4(6): 342 -348.
6Cribier B, Asch P, Grosshans E. Differentiating squamous cell carcinoma from keratoacanthoma using histopathological criteria. Is it possible? A study of 296 cases [ J ]. Dermatology, 1999, 199(3): 208 -212.
7Vergara. A, Isarria M J, Domtnguez JD, et al Multiple and relapsing keratoacanthomas developing at the edge of the skin grafts site after surgery and after radiotherapy [ J ]. Dennatol Surg, 2007, 33(8): 994-996.
8Annest NM, VanBeek MJ, Arpey CJ, et al. lntralesional methotrexate treatment for keratoacanthoma tumors : a retro- spective study and review of the literature [ J ]. J Am Acad Dermatol, 2007, 56(6): 989-993.
9Jeon HC, Choi M, Paik SH, et al. Treatment of keratoaean- thoma with 5 % imiquimod cream and review of the previous report[J].Ann Dermatol, 2011, 23(3): 357 -361.
10Mngas C, Bielsa I, Ribera M, et al. A case of multiple ker- atoaeanthoma eentrifugum marginatum [J]. Dermatol Surg,2004, 30(5) : 803 -806.