“…Since only a limited number of cases have been reported for HPV-60-induced warts of the pigmented [3, 10, 12], nonpigmented [8, 9, 12]and cystic types [7, 9, 13, 14, 15], comparative studies between clinicopathological features and lesion-, host- and virus-related factors should be performed in a much larger number of patients to ascertain the true nature of HPV-60-induced warts. Factors that need to be studied include duration, anatomical location or history of previous treatment of the lesions, presence or absence of accompanying pigmentary disorders, immunological status or ethnic difference in the patients, or some divergences in HPV-60 DNA sequences among lesions.…”