The most frequent causes
1. Microtrauma
The most common cause is a minor impact or pressure on the nail . This can happen after bumping your finger against an object, after an overly aggressive manicure, or when pushing back cuticles.
These micro-traumas temporarily disrupt keratin formation, leading to the appearance of small white spots.
2. Allergic reactions
Some nail products can cause mild reactions. Harsh nail polishes, removers, or household cleaners can sometimes weaken the nail surface and cause whitish marks to appear.
