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Verrucous and "hyperkeratotic" are often synonymous for purpose of description or eliciting a differential diagnosis.
Single Verrucous Lesion:
| • | deep fungal (chromo)/atypical mycobacteria |
Other Verrucous:
| • | Epidermolytic hyperkeratosis |
| • | acrokeratosis verucciformis |
| • | acquired digital fibrokeratoma |
| • | epidermal nevus ( ILVEN, nevus sebaceous) |
| • | Perforating Disease (EPS) |
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| • | deep fungal (vs. atypical mycobacteria) |
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think "innoculation":
| • | atypical mycobacteria (vs. deep fungal) |
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| • | expanded ddx: Keratosis Lichenoides Chronica (rare), lichen amyloid (distinct), angikeratoma of Mibelli (rare) |
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