Reticular lentigo is a black macula, 4 - 6 mm in size, of irregular shape which frequently arouses clinical suspicion of a malignant melanoma. Examined by dermatoscopy it has a bizarre, irregular pigmented network. Histological examination reveals an increased amount of melanin in slightly prolonged and extended epidermal processes and usually a normal number of melanocytes. Typically the lesion is interrupted by differently oriented sections of the epidermis without an increased melanin content, so-called „skip areas“. Reticular lentigo is a relatively new unit, well defined clinically, dermatoscopically and histologically. Its differential diagnosis comprises in addition to melanoma in situ other forms of lentigo.

        Key words: reticular lentigo - clinical picture - dermatoscopy, histopathological findings - diffe-