IDIOPATHIC MACULAR PIGMENTATION

Background. Hyperpigmentation can be due to different cause or have no apparent cause. Case report. A 4 year-old boy was examined because pi gmentation had appeared 5 months earlier. The cutaneous lesions were b lue grey, macular (diameter: 2-3 cm), with a predilection for the trun k, the lower part of the neck and the proximal part of the legs. There was no pruritus and the lesions did not urticate when rubbed Histolog ically, there was epidermal acanthosis, moderate hyperkeratosis and de rmal infiltration with numerous melanophages. The clinical lesions rem ained stable 6 months later. Conclusion. The cutaneous manifestations and their course are similar to those of idiopathic macular pigmentati on usually reported in adolescents. Ultramicroscopic findings have led some authors to classify it as lichen planus.