What is the most appropriate response by a nurse to a primigravid client concerned about brown discoloration on her face?

The most appropriate response by the nurse to a primigravid client concerned about brown discoloration on her face is that this usually disappears after delivery. This is a common reassurance because brown discoloration, often referred to as melasma or the "mask of pregnancy," is typically a result of hormonal changes that occur during pregnancy. It is characterized by dark patches on the skin, especially on the face, and tends to resolve postpartum as hormone levels return to baseline. Understanding this condition and its transient nature can help alleviate the client’s worries about the discoloration.

The other responses do not provide accurate or appropriate information regarding this common skin change during pregnancy. Identifying it as a sign of skin melanoma is misleading and could cause unnecessary distress, while stating it is due to dilated capillaries is not accurate as melasma is specifically related to pigmentation changes, not vascular changes. Suggesting that it will fade with the use of a prescribed cream may imply that treatment is necessary when in fact, reassurance about the natural resolution of the condition is more appropriate.