Which condition is characterized by a pink/light red maculopapular rash lasting three days and may cause joint pains in young women?

The condition characterized by a pink/light red maculopapular rash lasting three days, along with potential joint pains, especially in young women, is indeed Rubella.

Rubella, also known as German measles, typically presents with a distinct rash that starts on the face and then spreads to the trunk and extremities. The rash is generally light pink or red and may appear maculopapular. One of the notable clinical features of Rubella is that it can cause mild joint pain, particularly in adolescent girls and young women, due to the immune response.

Additionally, this condition is part of the MMR (measles, mumps, rubella) vaccination schedule and is significant because of its teratogenic effects if contracted during pregnancy, which can lead to serious complications for the fetus.

In contrast, Roseola usually presents with a high fever that resolves before the onset of a rash, and the rash is typically not maculopapular. Pityriasis rosea is characterized by a herald patch and a more scaly rather than macular rash, while Rubeola, or measles, has a more severe rash that is usually darker and accompanied by other systemic symptoms.