It looks like Mealybug or some kind of scale.

I agree, it looks like mealybugs..

There is something called Palm Leaf Skeletonizer. It may not be this but Neem Oil is always good to use as a pest killer.

Palm leaf skeletonizer

The insect pest that is responsible for this damage inhabits and feeds on the tissues of the palm’s leaf. When this happens the leaves will take on a sickly appearance with a sawdust-like looking material. If this disease is not taken care of immediately can spread to the entire leaf. What is left after the destruction is the veins and the bare midribs, in other words, the entire leaf will be stripped?

Theinfected leaves should be removed immediately at first sign to avoid spreading of this disease. Because if this disease is allowed to spread to the healthy leaves will be hard to control weakening the palm. If all of the leaves are infected because of not taking quick action the entire leaves will have to be removed which puts your queen palm in greater danger.

Remove the infected leaves with a hand pruner and apply neem oil or sevin to bring this garden insect pest under control. After use, the pruner should be sterilized with alcohol and water then sprayed with WD 40.