hairline rash causes
Forehead Rash Causes (Allergic) Allergies or reactions to allergens are also notorious causes of forehead rash. Allergies often cause a forehead rash that comes and goes, or forehead rash bumps. The most common causes of a forehead rash caused by a reaction to an allergen include: An allergic form of contact dermatitis, such as an allergy to a facial cream Atopic dermatitis, a type of inflammation of the skin