What could be the cause of red lines appearing in my nails?

Red lines in nails, also known as nail lines, can appear due to several reasons. According to the available references, these lines can be associated with trauma to the nail or underlying skin conditions.

Possible Causes:

1. Trauma: Physical injury to the nail can cause red lines to appear. This could be from hitting your nail or other forms of pressure.
2. Skin Conditions: Conditions like lichen planus can cause changes in nail appearance, including red lines. This is a skin condition that can affect nails and appears in a specific pattern known as Blaschko lines.

What to Look For:

• Color and Shape: Observing the color and shape of the lines can provide important clues. For example, if the lines are horizontal, it might indicate a different issue than if they are vertical.

If you notice red lines in your nails, it might be helpful to think about any recent injuries or changes in your health. However, for a proper diagnosis, consulting a healthcare professional is recommended.