Fungal infection of the nail, medically called Onychomycosis, can be classified as 4 basic types.
Distal Subungual Onychomycosis (DSO)
The most common form of nail fungus. It is usually caused by a fungus called T. Rubrum, which also cause athlete’s foot. T. Rubrum infects the nail bed and underneath the nail plate that changes nail color into yellow/white.
As the infection becomes worse, nail gets more brittle and separated from the nail bed.
White Superficial Onychomycosis (WSO)
The second most common form of fungal nail infection. It is caused by a fungal infection of the nail at the superficial layer.
In the early stages, you will see white spots on your nails. As the symptom develops, the white chalky powder will start covering the whole nail.
Since it is often misdiagnosed as keratin granulations, which is not caused by a fungus, a laboratory test should be performed for the diagnoses.
Proximal subungual onychomycosis (PSO)
The least common form of fungal nail infection, but it is found most commonly among people who has an impaired immune system, such as patients with HIV.
It is the fungal infection of the newly formed nail plate
The infection causes nail discoloration and separation of the nail from the nail bed.
Candida is a yeast that causes fungal nail infections.
It is more common in fingernails than toenails, especially among those who often immerse their hands in water.
People usually get this type of infection when they have trauma or injury on their nails. Unlike other types of onychomycosis, it may be painful.