C4A.2

Clinical Causes: Exposure to ultraviolet (UV) radiation from the sun or tanning beds, which can damage skin cells and lead to cancer development. Immunosuppression, such as in individuals with weakened immune systems due to medical treatments or diseases. Advanced age, as Merkel cell carcinoma predominantly occurs in older adults. Previous skin cancers or extensive sun damage to the ear and surrounding skin. Possible genetic factors, although these are less clearly understood.

Key Symptoms: A rapidly growing, painless, firm, and dome-shaped skin nodule on or around the ear or within the external auditory canal. A lesion that may be skin-colored, blue, or red, often with a shiny or smooth surface. The lesion may sometimes ulcerate or become crusted. Swelling or enlargement of nearby lymph nodes in the head or neck region. In some cases, symptoms such as pain or bleeding may occur if the tumor invades deeper tissues.

Diagnosis Path: Diagnosis typically involves a combination of clinical examination and confirmatory tests. A healthcare provider will examine the lesion and assess regional lymph nodes. A biopsy, often an excisional or punch biopsy, is essential to confirm Merkel cell carcinoma. Additional testing may include imaging studies like MRI, CT, or PET scans to evaluate local spread or metastasis. The staging process helps determine the extent of the disease, which guides treatment options.

Treatment Protocols: Surgical excision to remove the tumor with clear margins, often combined with Mohs micrographic surgery for tissue-sparing precision. Lymph node evaluation and removal if metastasis is suspected or confirmed. Radiation therapy, used to target residual cancer cells or in cases where surgery isn't feasible. Immunotherapy, including immune checkpoint inhibitors, to boost the body's natural ability to fight the cancer. Chemotherapy may be considered in advanced cases where other treatments are insufficient. Regular follow-up and imaging studies to monitor for recurrence or metastasis.