Melasma is an acquired hypermelanosis skin disorder that commonly affects women than men. It is characterized by irregular light to dark brown macules occurring in the sun-exposed areas of the face, neck and arms.
It occurs most commonly with pregnancy and with the use of contraceptive pills.
Other factors implicated in the etiopathogenesis are photosensitizing medications, mild ovarian or thyroid dysfunction and certain cosmetics.
Solar and ultraviolet exposure is the most common important factor in its development.
Oral H1-antihistamines are the initial treatment of choice for allergic rhinitis (AR) and chronic urticaria in the primary care setting. However, in a diverse population of patients with AR and urticaria, primary care physicians are faced with the challenge of prescribing the best therapy amid a wide armamentarium of antihistamines available.