Table 1.

Punctate leukonychia

True leukonychia
Traumatic	Cryotherapy for the treatment of periungual warts, over-zealous manicure [17, 18], nail biting [18, 19], traumatic event of proximal nail fold [20]
Neurovascular disorder	Reflex sympathetic dystrophy [21], epilepsy [22]
Skin disease	Psoriasis [18], alopecia areata [14, 18, 23], lichen planus [24], mycosis fungoides [25], vitiligo [26]
Deficiency	Zinc [27]
Others	Renal transplant recipient [28]
Apparent leukonychia	Not existent
Pseudoleukonychia
Exogeneous compound	2-Ethyl-cyanoacrylate glue [29], granulation
Skin disease	White superficial onychomycosis [30, 31], proximal subungual onychomycosis
Traumatic