The document discusses the different subtypes of rosacea, a skin condition that causes redness and pimples on the face. There are 4 main subtypes of rosacea: erythematotelangiectatic rosacea, papulopustular rosacea, phymatous rosacea, and ocular rosacea. Each subtype has a scientific name and number and causes certain symptoms depending on where it appears on the face or eyes. The subtypes can sometimes progress from one to another or occur together, and doctors diagnose the subtype based on symptoms to prescribe appropriate treatments.