Is There A Name For This Type Of Error Or Is It An Error At All?

Photos please.
John1

Without pictures of your specific coin/medal, it is impossible to say whether it is an error or not. But we can speak in generalities.

A raised area on a coin or medal is created when a die has a depression or groove in it. For that depression to be "missing", it needs to be either filled in somehow, or never put there in the first place.

A "filled die" or "grease-filled die" can happen, usually on a very-large-mintage mass-production run, where "grease" fills in the depression on the die. It should perhaps be noted that this "grease" is high-temperature lubricant mixed with finely powdered metal; it is rock-hard at room temperature and won't "squirt out" from between the die and coin like regular grease would.

For the depressed area never to have been added in the first place, would be a deliberate design decision of the people making the die, especially for a very-large-mintage run as dies for such coins/medals are usually produced by making a reproduction of a master die, which should have all of the required details included. A mint that somehow "forgot" to include an important element of their coin/medal, such as the date of issue or the weight and fineness of the precious metal, would be a careless mint indeed. If it happened, I suppose one would call it an "error in design" - though since the "error" is deliberately placed on the die, and they presumably used that die to make more than one coin/medal, it would more properly be termed a "variety" rather than an "error".

Posted some photos. Anyone?