Pityriasis versicolor
light desquamation, blurred borders
Pityriasis alba
Wood's lamp examination with yellow/green fluorescence
KOH positive
Chemical leukoderma
Tuberculoid Leprosy (Hansen's disease)
Hipopigmented nevus
stable macule, unilateral
Hipomelanosis of Ito (Incontinentia pigmenti achromians)
follows lines of Blaschko
Nevus anemicus
no contrast on Wood's lamp examination
no erythematous response to trauma, cold or heat
Tuberous sclerosis
stable polygonal confetti macules
Piebaldism
alternating hyperpigmented macules on hipopigmented patches
triangular shaped depigmented patch on forehead
Tinea versicolor
light desquamation, blurred borders
Wood's lamp examination with yellow/green fluorescence
KOH positive
stable macule, unilateral
follows lines of Blaschko
no contrast on Wood's lamp examination
no erythematous response to trauma, cold or heat
stable polygonal confetti macules
alternating hyperpigmented macules on hipopigmented patches
triangular shaped depigmented patch on forehead
Vitiligo
Pityriasis versicolor
Bullosis diabeticorum
light desquamation, blurred borders
Psoriasis
Pityriasis alba
Phytophotodermatitis
Wood's lamp examination with yellow/green fluorescence