A Multicenter, Open-label Clinical Trial to Evaluate the Efficacy and Safety of Once Daily Mirvaso® Gel in Patients With Chronic Persistent Vascular Facial Erythema.

Inclusion Criteria: 1. Male or female research participants aged 18 or higher. 2. Patients with chronic persistent facial erythema (at least 1 month before baseline \[Day 1 hour 0\]) of rosacea (with no restrictions to subtypes of rosacea), or originated from other dermatological condition, including, but not limited to seborrhoeic dermatitis, ulerythema ophryogenes, keratosis pillaris, microneedling, fractional radiofrequency, post-peeling treatments (medium depth and deep) or post-laser (ablative laser). Diagnosis is based on the investigator clinical judgement. 3. Clinician Erythema Assessment scores 2 (mild), 3 (moderate), or 4 (severe) at Day 1 prior to study treatment administration. 4. Patient Self-Evaluation scores 2 (mild), 3 (moderate), or 4 (severe) at Day 1 prior to study treatment administration. 5. Female patients with childbearing potential and negative pregnancy test at baseline. These patients should use a highly efficient contraceptive method during the study: combined oral contraceptives (estrogen and progesterone) or implanted contraceptives, or injectable contraceptives (with a stable dose for at least 1 month before study enrolment), bilateral tube ligation, hormonal intrauterine device (inserted at least 1 month before study entry), strict abstinence (at least 1 month prior to study entry and agreement in continuing throughout the study), or vasectomized partner (at least 3 months prior to study entry). 6. Female patients without childbearing potential (e.g., before menstruating, post-menopausal \[absence of menstrual bleeding for 1 year prior to study entry\], hysterectomy, or bilateral oophorectomy, less than one year after menopause). 7. Patients willing and able to fulfill the protocol requirements and duration. 8. Patients who understand and sign the Informed Consent Form at study inclusion, before any study procedure is carried out. Exclusion Criteria: \- Any research participant that meets one or more of the following criteria is not eligible for the trial: 1. Female patients who are pregnant, breastfeeding or planning for pregnancy. 2. Current treatment with monoamine oxidase inhibitors, barbiturates, opiates, sedatives, systemic anesthetics or alpha agonists. 3. Patients who started or changed their doses of tricyclic antidepressants, cardiac glycosides, beta-blockers or other anti-hypertensive agents, in the 3 months prior to study entry. 4. Current diagnosis of Raynaud syndrome, thromboangiitis obliterans, orthostatic hypotension, severe cardiovascular disease, coronary or cerebral insufficiency, hepatic or renal failure, sclerodermia, Sjögren syndrome, or depression. 5. Any chronic or severe uncontrolled disease or medical chronic which may interfere with the interpretation of the study results, or may present a significant healthcare risk to the patient, if he/she participates in the study in accordance with the investigator judgment. (e.g. endocrine tumors, chromocytomas, systemic diseases that cause vascular erythema). 6. Known or suspected allergies or hypersensitivities to any of the components of the study treatments, including the active substance of brimonidine tartrate (see summary of product characteristics). 7. Patients who received, applied or ingested the following treatments in accordance with the time period specified before Day 1: * Topic facial treatments or procedures: Any dermatological/surgical facial procedure - 4 weeks. Immunomodulators (e.g. Methotrexate, Cyclosporin) - 4 weeks. Mirvaso® - 4 weeks. * Systemic treatments: Isotretinoin - 6 months. Immunomodulators - 90 days. Phototherapy - 4 weeks. 8. Exposure to excessive ultraviolet radiation within a week before Day 1 visit. 9. Presence of beard or excessive facial hair at Day 1, which interferes with the study treatment or study assessments and refusal to remove it during the study period. 10. Patients who do not wish to abstain from the use of forbidden medication or excessive exposure to ultraviolet radiation during the study period. 11. Vulnerable research participants (as deprived of freedom), in accordance with Section 1.61 of the International Conference on Harmonization of Technical Requirements for Registration of Pharmaceuticals for Human Use - ICH for Good Clinical Practices. 12. Current participation in any other clinical study with a drug or device OR participation within 30 days prior to Day 1 OR in an exclusion period of a previous clinical study (when possible).