What type of nail infection can cause yellow discoloration and thickening?

• A. Bacterial infection
• B. Fungal infection
• C. Viral infection
• D. Chronic dermatitis

Answer: (B)

A fungal infection is indeed known for causing symptoms such as yellow discoloration and thickening of the nails. This condition, often referred to as onychomycosis, is characterized by a fungal invasion that leads to changes in the nail plate. The fungus can thrive in warm, moist environments, and over time, it causes the nail to become discolored, brittle, and thickened as the infection progresses.

In contrast, bacterial infections typically lead to different nail changes, such as redness, swelling, and possible discharge, but not the yellowing or thickening characteristic of a fungal infection. Viral infections might affect the skin around the nails but are less commonly associated with direct alterations in nail color or thickness. Chronic dermatitis can cause nail changes, but it would not specifically result in the yellowing and thickening associated with fungal infections.