The Four Subtypes of Acne Rosacea

Erythema to telangectatic –flushing and persistent redness.
Phymatous—skin thickening and enlargement usually around the nose.
Papulopustular—persistent redness with bumps or pimples.
Ocular—irritation and stinging of the eyes resulting in watery and/or blood shot appearance.

The underlying cause (s) of acne rosacea is not clear, but involve vascular factors such as increased blood flow, and increased fluid and tissue interaction with the nervous system by cleaning.

Much more is known about what triggers rosacea, the most common being to sun exposure, emotional stress, hot, cold and / or windy. Some food, beverages, drugs and skin care products can also have a negative effect.

Acne Rosacea Treatment Therapy Combines:

Consistent use of a broad spectrum sunscreen
Topical antibiotics and anti-inflammatories
Mild and/or medicated cleansers
Oral antibiotics (used for their anti-inflammatory properties)
Pulsed dye lasers and intense pulsed light devices (targeting persistent redness and blood vessels)

Source : http://www.dermspecpa.com/medical/rosacea/