Nail fungal infections come in many different shapes, colors, and sizes. They have an array of characteristics and some of these characteristics fall similar to other types of infections or occurrences on the nails. Mold is one such infection that is confused for a nail fungus. A bacteria known as pseudomonas is responsible for the discoloration on the nails, usually a yellow-greenish color, green, or black-green stain. Furthermore, this type of bacteria may also cause a pus or a detachment of the nail from the nail bed.
Pseudomonas is typically the result of a bacteria that is water borne, meaning that it is transmitted through water and thrives in moist and warm environments. This particular infection is more commonly seen with acrylic/artificial nails. Since the acrylic/artificial ingredients cause lifting, which allows moisture to easily enter and infecting the natural nail.
If you notice a change of any kind in the nails you should firstly contact a healthcare professional to be sure of what you have. If in fact it is a fungal infection, treatment options are available. A home remedy of a vinegar soak might to the trick by simply mixing half vinegar and half water together in a small tub (or bowl if occurring on the fingernails) and allow the nails to soak for about five minutes. You may do this until you see a change in the nail, however if no change is seen after a month or two you should consider seeking professional help and make sure this is the case.