Are the Battles of Lexington and Concord considered to be a cause of the American Revolution?
No. The Battles of Lexington and Concord are not typically seen as causes of the Revolution. Instead, they are seen as the first battles of that conflict.
The causes of the Revolution are political and economic things. The Revolution was caused by things like the British taxation of the colonies after the French and Indian War or the failure of the British to allow the colonies to have enough power over their own affairs.
The causes of a war do not tend to be battles. Battles are symptoms, not causes. The causes of wars tend to be found in the realms of politics and economics. These sorts of political and economic changes caused the Battles of Lexington and Concord and so we do not refer to the battles themselves as causes of the Revolution.