BACKGROUND
Epidermolytic acanthoma (EA) is a rare, benign acquired cutaneous keratosis displaying epidermolytic hyperkeratosis in more than 50% of its surface. Due to the sparsity of comprehensive studies, little is known on the patient demographics and clinical characteristics of this uncommon entity. We wish to comprehensively characterize the clinical and demographic features of EA and to differentiate it from its mimickers.
METHODS
We carried out a retrospectively review of 131 cases of EA, recorded clinical and histopathologic features and performed linear regression of yearly incidence rates to assess for possible under‐reporting of this entity.
RESULTS
EA affected both genders equally. We found 9.08 cases per 100,000 biopsy specimens per year and linear regression analysis demonstrated significant decreasing incidence rates. Analysis of the anatomical site distribution of EA lesions demonstrated a more frequent genital location in men (39.1% of cases in men, as compared to 11.3% for women). Contrary to previous studies, lesions were most frequently single (91.7%) and the mean age of presentation was 57.8 years.
CONCLUSION
The presented largest case series to‐date indicates that EA is likely an underdiagnosed entity and establishes the demographic and clinical features of EA.
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