{'fraction_non_alphanumeric': 0.02564102564102564, 'fraction_numerical': 0.0033085194375516956, 'mean_word_length': 5.05, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Psoriasis of the lips: an unusual localization

Discussion Nevus spilus (speckled lentiginous nevus) is a relatively common melanocytic lesion (about 2% of dermatologic patients) composed of numerous, tiny, pigmented spots or papules on a tannish macular background. It may be congenital or may present during childhood; at birth or in early childhood, the lesion consists of a flat tan macule, but, at puberty, slightly elevated papules develop inside the macule. The dimension of nevus spilus is variable, ranging from 2 cm to more than 10 cm. Histologically, the tannish macule mostly shows only a mild melanocytic hyperplasia, whereas the small flat spots have features of simple lentigo; the pigmented papules are junctional or compound nevi, but also Spitz nevi or blue nevi can be observed. Very few cases have been described of melanoma arising on nevus spilus. This case is an additional report of melanoma arising on nevus spilus, with the additional peculiarity of multifocality. Possible occurrence of melanoma on nevus spilus justifies a long-term follow-up of all patients (with the help of photography or videomicroscopy), as well as an early excision of the lesion if atypical areas are noted.