Rosacea is one of the only skin conditions that doesn’t have a pathological definition – it doesn’t have a defined cause or biological marker that can be identifiably linked to it. Instead, rosacea is essentially a spectrum of symptoms ranging from flushed red cheeks to pustular nodes and affects individuals with fair and light skin.
In its milder form, rosacea looks like flushed red skin and visible capillaries (vascularization) at the surface of the skin – kind of like the redness you get from exercise, but it just never goes away. In its more aggressive states, it can take the form of bumps and pustules in addition to redness. For this reason, it’s sometimes mistaken as acne.