Aloe microstigma leaves are variable, blue-green to reddish green with many (or few, or on rare ones near Robertson, sometimes without) small white spots scattered over both upper and lower surfaces. The second adjectival part of the scientific name, the specific epithet, microstigma, means small mark in Greek. The leaf surfaces are free of spines, but along the margins there are sharp and rigid, evenly spaced, reddish brown teeth or prickles. These defences bring second thoughts to potential enemies who might mean harm to the plant.
The leaf-shape is long, thick with succulence, forming an isosceles triangle from the base and tapering to an acute-angled tip. The leaf curvature varies from bow-shaped (curving inward when stressed or outward on young branches) to S-shaped with outwardly arched tips, while the lower part bend inwards or upwards from the base. There is also a measure of twisting and sideways curvature in some leaves (Van Wyk and Smith, 2003; Reynolds, 1974).