Зображення 00466. Small bluish patch in the proximal nail caused by trauma

A small bluish patch in the proximal nail is most often caused by trauma, as here. The possibility of malignant melanoma should also be considered. If the lesion tends to form a longitudinal tract subungually, a surgical exploration of the matrix is indicated. A further sign of malignant melanoma would be a dark pigment in the skin of the proximal nail fold.