It can appear very similar to anaplastic large cell lymphoma. Type "A" is CD30 positive, while type "B" is CD30 negative. It has been described as "clinically benign but histologically malignant."
Lymphomatoid papulosis
Hydrocarbon keratosis
Arsenical keratosis
Pyogenic granuloma
Reactional keratosis
Actinic granuloma
Actinic keratosis
Generalized trichoepithelioma