Final answer:
Onychatrophia is not caused by fungus; it is a condition where the nail loses its lustre and may shed due to non-fungal factors such as injury or illness.
Step-by-step explanation:
Among the nail diseases listed, Onychatrophia is not caused by fungus. Tinea pedis, also known as athlete's foot, Tinea manus, and Onychomycosis (also known as tinea unguium) are all fungal infections caused by dermatophytes. Onychatrophia is an atrophic condition of the nail plate causing it to lose its lustre, become smaller, and sometimes shed entirely. Unlike the other conditions listed, which are superficial cutaneous mycoses, onychatrophia can be caused by a number of non-fungal issues such as injury, illness, or a side effect of medication.