Familial gigantic melanocytosis

Cutaneous examination revealed diffuse reticulate hyperpigmentation over the face, extensor aspect of upper extremities, the "V" area of neck and photo-exposed parts of the chest [Figure 1]a. In addition, there were multiple discrete, tiny, hypopigmented macules interspersed on the pigmented areas over the upper extremities and trunk [Figure 1]b and [Figure 1]c. A lightening in colour of the eyelashes, eyebrows, beard and scalp hair was noted.General and systemic examination of the patient revealed no other abnormalities.[...]the differential diagnoses of lichen planus pigmentosus, erythema dyschromicum perstans and dyschromatosis universalis hereditaria were considered.[...]there was reticulate pigmentation over the sun-exposed areas, in contrast to the diffuse hyperpigmentation in the cases originally described in literature.