Nail Signs Green nail syndrome 绿甲综合征

Green nail syndrome
The yellow–green to green–black nail plate discoloration is due to the production of the pigments pyocyanin and pyoverdin by Pseudomonas aeruginosa. This discoloration is most often present in the subungual space created by onycholysis and less often in the lateral nail plate. Predisposing factors include prolonged exposure to water, use of detergents and soaps, nail trauma, and other causes of onycholysis or paronychia. Not surprisingly, this disorder is seen in barbers, dishwashers, bakers, and medical personnel.

Pseudomonas colonization can be eliminated from the nail surface by applying a few drops of 2% sodium hypochlorite solution (or household chlorine bleach diluted 1 : 4 in water) and from the subungual space by soaking the affected digits in the same solution for 5 minutes per day for 20–30 days. The underlying nail disorder must also be addressed, e.g. clipping back the detached nail plate if there is onycholysis.





Antonella Tosti, Bianca Maria Piraccini. In: Jean Bolognia Julie Schaffer Lorenzo Cerroni, editors. Dermatology: 2-Volume Set 4th Edition. Elsevier; 2017. p1206-1207.