Mercury poisoning from amalgam fillings causes acne, dermatitis, psoriasis, and rosacea.

Any swelling or infection of the face may be caused by toxic mercury from leaking dental fillings.  Silver amalgam fillings contain 50% toxic mercury.  Treatment for the condition without removing the underlying cause will only be treating the symptom.

 Acne rosacea is a common disorder affecting facial skin. Its most persistent feature is a bright red flush. People affected are usually in the 35-50 range of age, most are females, but severity is generally greater in males. Fair skinned people are more often affected.

Recurrent flushing and blushing is present and late in the disease the nose may be enlarged with thick red skin, a condition known as "rhinophyma." Enlargement of the nose is more common in males. Also, along with thicker skin, the oil glands of the face enlarge and are more active giving an oily appearance. Swelling of the face may be present along with stinging of the cheeks, forehead and ears.

A likely cause of acne rosacea, acne vulgaris, sebhorrheic dermatitis, perioral dermatitis is an overload of mercury, usually from dental amalgams, and Thimerasol in vaccines and/or cosmetics.
Unless the cause is identified and treated, this tends to be a chronic progressive disease which comes and goes and generally slowly increases.

For perioral dermatitis a course of doxycycline and topical erythromycin may help.

To chelate the underlying cause, the heavy-metal-bioaccumulative mercury out of our bodies, use the Andy Cutler protocol.
http://mercuryconspiracy.blogspot.com/p/chelation-andy-cutler-protocol-oral.html