The ABCD rule can be easily learned and rapidly calculated, and has proven to be reliable. It should be routinely applied to all equivocal pigmented skin lesions to reach a more objective and reproducible diagnosis and to obtain this assessment preoperatively.
A 35-year-old male patient affected with extensive, itching skin lesions of reticulate porokeratosis is reported. He was successfully treated by CO2-laser vaporization.
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