What condition is characterized by blood clots forming under the nail plate?

• A. Bruised nails
• B. Eggshell nails
• C. Beau's lines
• D. Infection

Answer: (A)

The condition characterized by blood clots forming under the nail plate is bruised nails. This typically occurs when there is trauma to the nail or finger, which causes small blood vessels to break, leading to bleeding beneath the nail. The visible result is a dark discoloration that can range from red to purple, depending on the extent of the bruising and the blood's proximity to the surface of the nail.

In contrast, eggshell nails refer to a type of nail that is thin, fragile, and often bends or breaks easily, which is not related to the presence of blood clots. Beau's lines are horizontal ridges that can appear on the nails due to a temporary interruption in nail growth, often caused by illness or trauma, but they do not involve bleeding. An infection under the nail, such as onychomycosis or paronychia, generally presents with other symptoms like redness, swelling, or pus, rather than blood clots forming beneath the nail plate. Therefore, bruised nails is the most accurate description for blood clots under the nail.