An 83-year-old man complains that for the last few weeks he has had a bleeding lesion on his chest that seems to be growing rapidly. The lesion is shown below. What is the single most likely diagnosis?
**Core Concept**
The underlying principle being tested involves the identification of skin lesions, particularly those that are potentially malignant. **Dermatological examination** and knowledge of **skin cancer** types are essential for diagnosing such conditions.
**Why the Correct Answer is Right**
Given the description of a rapidly growing bleeding lesion in an elderly individual, the most likely diagnosis is a form of skin cancer. **Basal cell carcinoma** and **squamous cell carcinoma** are common types, but the rapid growth and bleeding suggest a more aggressive form, such as **squamous cell carcinoma** or possibly **melanoma** if pigmentation is involved. However, without specific details on the appearance (e.g., color, shape), **squamous cell carcinoma** is a plausible choice due to its potential for rapid growth and bleeding, especially in sun-exposed areas or in older adults.
**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific details of the options, we can't directly address why each is incorrect, but generally, other types of skin lesions (benign or malignant) might not exhibit the same rate of growth or bleeding pattern.
**Option B:** Similarly, this could represent a less likely diagnosis based on the description provided.
**Option C:** This might be a consideration if the lesion had different characteristics (e.g., slower growth, different appearance).
**Clinical Pearl / High-Yield Fact**
It's crucial to remember that any new or changing skin lesion, especially in older adults, warrants further investigation due to the potential for **skin cancer**. The **ABCDE rule** for melanoma (Asymmetry, Border, Color, Diameter, Evolving) is a helpful mnemonic for identifying potentially malignant lesions.
**Correct Answer:** D. Squamous cell carcinoma.