Agaricus arorae is a moderate-sized, forest-dwelling mushroom that exhibits distinctive color changes.

Unusually within the genus Agaricus, the mushroom's cap cuticle turns yellow when exposed to a base such as potassium hydroxide or sodium hydroxide but stains red when cut.

The cuticle slowly bruises a reddish colour, and yellows with KOH.

The context can be as large as 5 mm thick, soft, and bruises irregularly a vinaceous colour where cut.

The apex surface is white, and patchy fibrillose over a dull-buff ground color.