A diagram in which relationships between variables are represented by other visual means is sometimes called a graph, as in a bar graph, but may also be called a chart. Origin: [See -graph.]
Nail fungus can be caused by several different things and the cause of the infection is often difficult or even impossible to identify.Here are some common nail fungus culprits:1  Growing Older.ail fungus can be caused by several different things and the cause of the infection is often difficult or even impossible to identify. Here are some common nail fungus culprits: 1  Growing Older.
The primary fungi that cause onychomycosis are Trichophyton rubrum and Trichophyton mentagrophytes. They are dermatophytes (fungi that infect hair, skin, and nails) and feed on keratinized (nail) tissue. The infections they cause are normally confined to the nails, but occasionally spread to the surrounding skin. Another type of onychomycosis is caused by yeast (Candida albicans or Candida parapsilosis).