title: Rapidly growing nodule on the cheek of a 12-year-old boy.
authors.affiliation: Melanoma Unit, Dermatology Department, Hospital Clinic of Barcelona, Barcelona, Spain; August Pi i Sunyer Biomedical Research Institute (IDIBAPS), Barcelona, Spain.
authors.forename: Ivette
authors.initials: I
authors.lastname: Alarcon
authors.affiliation: Melanoma Unit, Dermatology Department, Hospital Clinic of Barcelona, Barcelona, Spain; August Pi i Sunyer Biomedical Research Institute (IDIBAPS), Barcelona, Spain; Centre of Biomedical Research on Rare Diseases (CIBERER), Instituto de Salud Carlos III, Barcelona, Spain.
authors.forename: Josep
authors.initials: J
authors.lastname: Malvehy
authors.affiliation: Melanoma Unit, Dermatology Department, Hospital Clinic of Barcelona, Barcelona, Spain; August Pi i Sunyer Biomedical Research Institute (IDIBAPS), Barcelona, Spain; Centre of Biomedical Research on Rare Diseases (CIBERER), Instituto de Salud Carlos III, Barcelona, Spain; Department of Medicine, Universitat de Barcelona, Barcelona, Spain. Electronic address: susipuig@gmail.com.
authors.forename: Susana
authors.initials: S
authors.lastname: Puig
mesh_terms: D002610:Cheek; D002648:Child; D046169:Dermoscopy; D005153:Facial Neoplasms / Q000473:pathology*; D006201:Hair Diseases / Q000473:pathology*; D006801:Humans; D008297:Male; D018296:Pilomatrixoma / Q000473:pathology*; D012878:Skin Neoplasms / Q000473:pathology*