Table 1 Study demographics, sample size, and primary anatomic locations

Andruchow et al. 2006 [13]

Australia

322

Head & Neck

Audet et al. 2004 [14]

Canada

56

Head & Neck

Brantsch et al. 2008 [5]

Germany

615

Lip (26%), ear (13%), other (61%)

Bobin et al. [15]

France

35

Ear (12%), temple (12%), scalp (6%), recurrent lesion (6%)

Ch'ng et al. 2008 [16]

New Zealand

170

External ear (26.5%), cheek (12.9%), temporofrontal (18.8%), scalp (11.2%), lower lip (10.6%), upper lip (0.59%), nose (3.53%), eyelid (1.18%), neck (2.35%), multiple head and neck (12.4%)

Chua et al. 2002 [17]

Australia

52

Head & Neck

Clark et al. 2012 [9]

Australia

603

Head & Neck

Creighton et al. 2018 [18]

US

62

Head & Neck

de Koning et al. 2009 [19]

Netherlands

99

Oral cavity and oropharynx

Ebrahimi et al. 2013 [20]

Australia

229

Face (55.4%), external ear (20.1%), scalp (17.1%), neck (5.7%), other H&N (1.7%)

Eigentler et al. 2017 [21]

Germany

1434

Ear (14.4%), Lip (lower vermilion surface) (6.4%), Other (79.2%), Face, other (65.6%), Body, other (13.7%)

Forest et al. 2010 [22]

Australia

215

Head & Neck

Garcia-Pedrero et al. [23]

Chile

100

Head & Neck

Goh et al. 2012 [24]

Australia

66

Head & Neck

Haisma et al. 2016 [25]

Netherlands

336

Anterior aspect of the scalp (19.3%), posterior aspect of the scalp (10.8%), neck (4.25), nose (10.5%), lip (16.7%), ear (22.2%), other (16.3%)

Harris et al. 2017 [26]

US

212

Ear (22.65), cheek/temple (28.3%), lip (10.4%), neck (2.4%), nose (9.4%), periorbital (5.7%), scalp (15.6%)

Hinerman et al. 2008 [27]

US

117

Head & Neck

Hirshoren et al. 2017 [28]

Australia

149

Scalp (35%), preauricular (5%), ears (21%), nose (21%), lip lower/upper (11%), neck (1.8%), cheeks (9%), eye lids (0.9%), postauricular (95), chest (0.9%)

Jambusaria-Pahlajani et al. 2013 [29]

US

237

Lip or ear (58%), other (42%)

Kelder et al. 2012 [30]

Australia

164

Head & Neck

Khandelwal et al. 2016 [31]

US

37

Facial

Khurana et al. 1995 [32]

Australia

75

Head & Neck

Kreppel et al. 2013 [33]

Germany

63

Lower lip (34.9%), upper lip (1.6%), preauricular region (12.7%), nose (12.7%), ear (11.1%), front (4.8%), neurocranium (3.2%), cheek (19.0%)

Kyrgidis et al. 2010 [34]

Greece

315

Forehead and temple (17.5%), eyelids and periocular skin (13.0%), auricle and periauricular skin (23.8%), cheek (32.7%), nasal area (8.89%), neck (4.13%)

Makki et al. 2013 [35]

Canada

54

Head & Neck

McLean et al. 2013 [36]

Australia

100

Head & Neck

Mizrachi et al. 2013 [37]

Israel

71

Auricle (19.7%), cheek (16.9%), scalp (11.3%), preauricular region (9.86%), forehead (8.45%), temple (5.63%), chin (4.23%), eyelid (4.23%), neck (4.23%), lip (4.23%), nose (2.82%), other (8.42%)

Moore et al. 2005 [38]

US

193

Periauricular (30.6%), forehead/temple (20.2%), cheek (14.0%), nose (9.85%), scalp (8.29%), neck (6.22%), lower lip (4.66%), periorbital (5.2%), upper lip (2.07%)

O’Brien et al., 2002 [3]

Australia

87

Head & Neck

Oddone et al. 2009 [39]

Australia

250

Head & Neck

Palme et al. 2003 [40]

Australia

126

Head & Neck

Peat et al. 2012 [41]

New Zealand

170

Head & Neck

Pramana et al. 2012 [42]

Australia

75

Scalp (18.7%), ear (16.0%), face (8.0%), neck (2.67%), unknown (54.7%)

Schmidt et al. 2015 [43]

Australia

113

Head & Neck

Dyall-Smith et al. 2016 [45]

Australia

442

Head & Neck

Sweeny et al. 2014 [44]

US

238

Cheek (44%), orbit (2%), forehead (2%), preauricular (115), pinna (20%), postauricular (7%), temporal (6%), unknown (65)

Vasan et al. 2018 [46]

Australia

326

Skin of face (19%), external ear (12%), skin of nose (17%), skin of scalp and neck (10%), skin of lip (35), eyelid (< 1%), unknown (28%)

Veness et al. 2005 [6]

Australia

167

Head & Neck

Tseros et al. 2016 [47]

Australia

238

Head & Neck

Wang et al. 2012 [48]

Australia

122

Lip (27%), posterior scalp (9%), cheek (9%), nose (9%), ear (9%), other (37%)