<s>[INST] I have a noticable white line starting from under the cheek pad of my left cheek, crossing my nose above the nostrils and carrying onto my right cheek, following the same line as my left cheek (think of a cat face mask)! Make-up doesn t disguise it very effectivlely. [/INST] Hi Dear,Welcome to HCM.Understanding your concern. As per your query you have symptoms of  noticeable white line across the face which can occur due to causes such as stress ,hormonal changes , side effect of certain medicines or sun exposure. It could be due to underlying systemic pathology. Need not to worry. I would suggest you to :-- Avoid excessive exposure to sunlight and keep your skin covered.- Wash your face with face wash containing benzoyl peroxide .It is very effective for acne .- Apply azelaic acid containing cream , which is very effective for acne as well as dark spots .- Exfoliate your skin once a week for whitelines.Consult dermatologist for proper examination. Doctor may prescribe antibiotics course , isotretinoin or other steroid containing creams.Hope your concern has been resolved.Get Well Soon.Best Wishes,Dr. Harry Maheshwari </s>