## **Core Concept**
Salmon patches, also known as nevus simplex or stork bites, are benign vascular lesions commonly seen in infants. They are typically located on the face, specifically on the eyelids, nose, upper lip, and forehead, as well as on the back of the neck. These patches are due to a localized vascular anomaly.

## **Why the Correct Answer is Right**
Salmon patches are known to fade and often disappear as the child grows. The typical timeline for their disappearance is by the age of 1 to 2 years, although those located at the nape of the neck may persist into adulthood. The correct answer, therefore, aligns with the general understanding that salmon patches usually disappear by the age of 2 years.

## **Why Each Wrong Option is Incorrect**
- **Option A:** 5 years. This is too late for the typical disappearance of salmon patches, as most fade much earlier.
- **Option B:** 10 years. This is far beyond the usual timeframe for the disappearance of these lesions.
- **Option D:** 20 years. This option is also incorrect as salmon patches usually do not persist into adulthood, except possibly for those located at the nape of the neck.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that while salmon patches are benign and common, their presence on the face often leads to concern among parents. Reassurance is usually provided, as these lesions typically do not require treatment and will resolve on their own. It's also important to distinguish them from other vascular lesions that may require intervention.

## **Correct Answer:** . 2 years.