Which condition is NOT a congenital disorder?

Tinea Unguium, also known as onychomycosis, is a fungal infection that affects the nails. It occurs due to exposure to fungal organisms in the environment, making it an acquired condition rather than a congenital disorder.

In contrast, psoriasis and eczema are skin conditions that can arise due to genetic predispositions and immune system dysfunctions, but they are not classified as congenital disorders in the sense of being present at birth. Onychatrophia, which refers to the abnormal condition of the nails, may also arise due to various factors, such as trauma or systemic diseases, and while it can be associated with other congenital conditions, it’s not one itself.

Overall, the emphasis here is on understanding that congenital disorders are conditions that are present at or before birth, whereas tinea unguium develops after birth due to exposure to specific external microorganisms. Hence, identifying external causes as the basis for conditions like tinea unguium confirms it as the correct answer.