Elderly man with a long standing mole over the face which is increasing in size and showing irregular borders Diagnosis
**Core Concept**
Melanoma is a type of skin cancer characterized by the uncontrolled growth of pigment-producing cells called melanocytes. In elderly individuals, long-standing moles can transform into melanoma, especially if they exhibit changes in size, shape, and color.
**Why the Correct Answer is Right**
The irregular borders of the mole are a classic sign of melanoma. This is due to the uncontrolled growth of melanocytes, which can lead to the formation of new blood vessels and the invasion of surrounding tissues. The irregular shape is often a result of the melanoma cells infiltrating the dermal layer of the skin. The clinical significance of this sign is that it indicates a high risk of the melanoma spreading to other parts of the body.
**Why Each Wrong Option is Incorrect**
**Option A:** This option might be tempting, but it doesn't specifically address the irregular borders of the mole, which are a key diagnostic feature of melanoma.
**Option B:** While a mole increasing in size can be a sign of melanoma, it's not as specific as the irregular borders, which are often a hallmark of this cancer.
**Option C:** This option is too vague and doesn't provide a clear diagnosis. Melanoma can occur anywhere on the skin, not just on the face.
**Clinical Pearl / High-Yield Fact**
Remember the ABCDE rule for diagnosing melanoma: **A**symmetry, **B**order irregularity, **C**olor variation, **D**iameter greater than 6mm, and **E**volution (change over time). If a mole exhibits any of these characteristics, it's essential to consult a dermatologist for further evaluation.
**Correct Answer:** C.