The basic acne lesion, which is an enlarged hair follicle plugged with oil and bacteria.

Enlarged hair follicles filled with sebum (oil), dead cells and bacteria. If they are open to the skin surface, they are known as blackheads or open comedones. If they are closed to the skin surface, they are known as whiteheads or closed comedones.

skin coloured, small bumps (papules) frequently found on the forehead and chin of those suffering with acne

Are small black spots caused by the plug clogging of the skin pores, known as blackheads.

small, flesh colored, white, or dark bumps that give skin a rough texture. The bumps are found at the opening of a sebaceous follicle (pore). Whiteheads and /or blackheads. Frequently found on the forehead and chin of those with acne.

A plug of keratin and sebum within a hair follicle that is blackened at the surface.

commonly known as black heads or white heads, occur when a hair follicle becomes plugged with sebum (oil). When the sebum is exposed to the environment it can oxidized and turn black (black heads). When the follicle is closed and not exposed to the environment they are cream colored (white heads). Keratolytic agents (Glycolic acid and salicylic acid) are helpful in treating blackheads and whiteheads seen in acne.

Non-inflammatory acne lesion. There are three types of comedones. The microcomedo is a clinically invisible accumulation of corneocytes in the follicular canal. The microcomedo is the original acne lesion. The closed comedone (whitehead) evolves from the microcomedo and appears as a white dot. The open comedone (blackhead) appears as a dark-topped dot.