Hyperplasia
Dermatofibroma
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Dermatofibroma
, Solitary histiocytoma, Sclerosing Hemangioma, Nodulus Cutaneous, Fitzpatrick's Sign
Epidemiology
Males predominate (3:1 ratio)
Age of onset 20-50 years old
Pathophysiology
Idiopathic, benign, fibroblast proliferation
Causes
Idiopathic benign skin tumor
Fibrous reaction to local irritation
Local
Trauma
Insect Bite
Viral Infection
Folliculitis
Underlying condition (>15 Dermatofibromas)
Immunocompromised
patient
Autoimmune Condition
Symptoms
Asymptomatic in most cases
Lesions may be pruritic or tender
Signs
Characteristics
Small firm, raised
Papule
,
Plaque
or
Nodule
(3-10 mm)
Lesions develop over months and persist for years
Completely symmetric and regular
Tan or light brown surface (may be red or yellow)
Color is darker at center and gradually fades into normal
Skin Color
Fitzpatrick's Sign
Skin dimples downward with lateral compression
Distribution
Most common: Anterior thighs and Legs
Moderately common: Arms and Trunk
Uncommon: Head, Palms, and Soles
Variants
Multiple eruptive lesions
Seen in 0.3% of cases (typically
Immunocompromised
: HIV, SLE)
More than 15 Dermatofibromas are otherwise rare aside from this condition
Dermatofibrosarcoma Protuberans
Deep invasion with metastases
Differential Diagnosis
Primary Malignant
Melanoma
Scar
Blue Nevus
Pilar Cyst
Metastatic Carcinoma
Kaposi's Sarcoma
Management
Excision Indications
Repeated
Trauma
with bleeding, irritation
Unacceptable cosmetic appearance
Uncertain diagnosis (changes in size, color)
Techniques
Eliptical excision or
Punch Biopsy
Risk of scarring
Other methods (incomplete removal)
Laser ablation (may be preferred)
Shave Biopsy
Cryotherapy
References
Fitzpatrick (1999) Color Atlas Dermatology
Higgins (2015) Am Fam Physician 92(7): 601-7 [PubMed]
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