Likely caused by the mealybug treatment, too much water into the crown.

pouring a solution of a systemic fungicide such as benomyl or a general fungicide such as copper oxychloride into the growing point.

from here: http://www.polar-palm-palace.com/diseasesthatharmpalms.htm

Is your palm in a cold garage (where water doesn't evaporate in winter temps?)
Or inside the house?

Barb

"Sooty mold" text from same site.

Sooty mold refers to a layer of mostly harmless black fungal mold that can accumulate on palm leaves. It can be easily scraped off with one’s finger. There are several species of sooty mold fungi in Hawaii. These fungi are not parasitic on plant and therefore cause no infection to palm leaves. However, sooty mold is a nuisance and can block light from reaching plant leaves. The sooty mold fungi consume the sugary exudates (honeydew) that land on leaves from the feeding activities of sap-feeding insects such as mealybugs and scales. In order to control sooty mold, one must first control the insects responsible for the honeydew accumulation and the ants which tend to them and protect them from their natural enemies.

"Sooty mold" text from same site.

Sooty mold refers to a layer of mostly harmless black fungal mold that can accumulate on palm leaves. It can be easily scraped off with one’s finger. There are several species of sooty mold fungi in Hawaii. These fungi are not parasitic on plant and therefore cause no infection to palm leaves. However, sooty mold is a nuisance and can block light from reaching plant leaves. The sooty mold fungi consume the sugary exudates (honeydew) that land on leaves from the feeding activities of sap-feeding insects such as mealybugs and scales. In order to control sooty mold, one must first control the insects responsible for the honeydew accumulation and the ants which tend to them and protect them from their natural enemies.

The plant is indoors. To further support the "sooty mold" Sometimes when i scrape off the spots there is a faint white spot underneath. The mold has covered the meally bugs and is harder to see than the white meally bugs. Im scraping the whole tree with a spoon and blowing it off then then spaying it for meally bugs again.. Looks like it will take a few hours.. My majestic palm has non of these problems and is growing wild. I assumed it would be the other way..I may have the only indoor happy majesty out there 😆

I think the white stuff underneath is the mess that mealy bugs leave behind.
Think it's called "frass" (poop).

Since it's in the house, maybe during treatment, move it to a cool garage or a cooler spare room.
May help while you're putting fungicide on it (I still would apply it).

I may have the only indoor happy majesty out there

Wow...have always resisted buying one because no-one's been able to keep a majesty happy indoors.
Until now.
Good work!

Hope the fungicide works on your Trachy.
Barb