Rosacea
This is a common chronic disorder of the skin characterised by redness, flushing, and other cutaneous findings.
Risk factors:
Pale skin (Fitzpatrick skin type I/II)
Female
Family hx
Extreme temperature
Sunlight
Stress
Hot drinks
Hot baths/showers
Presentation
Flushing
Burning or stinging feeling when using water or skincare products
Dilated prominent telangiectases (primarily on the face)
Persistent facial erythema
Inflammatory papules and pustules
Rhinophyma - prominence of sebaceous glands on the nose, resulting in fibrosis

Investigations
Usually a clinical diagnosis, but could do a blood test for ANA if SLE is suspected.
Management
Avoiding common triggers e.g. hot baths, humidity, hot baths, hot drinks, heavy exercise; alcohol, spicy food
Skincare and sun protection
Other more specialist options for specific features e.g. topical a-agonists, isotretanoin, laser treatment