Final answer:
To test a tumor for skin cancer, a biopsy is performed where a sample of the lesion is taken and examined for cancerous cells. Dermatologists also use dermoscopy, mole mapping, or total-body skin exams for non-invasive screening of lesions for early detection of skin cancer.
Step-by-step explanation:
Skin cancer is the uncontrolled growth of abnormal skin cells, often resulting from DNA damage due to excessive exposure to UV radiation. Basal cell carcinoma and squamous cell carcinoma are highly curable cancers originating from cells in the stratum basale and stratum spinosum, respectively. The deadliest form, melanoma, affects melanocytes and can metastasize to other organs. Skin cancers can form cancerous lesions, and regular checkups with a dermatologist are crucial for early detection.
To test for skin cancer, dermatologists examine skin for suspicious lesions and may perform a biopsy. A biopsy involves taking a sample of the lesion, which is then analyzed for cancerous cells. For non-invasive screening, dermatologists may use tools such as dermoscopy or total-body skin exams. Skin cancer can also be detected through methods like a mole mapping or imaging techniques.
In case of a lesion suspected to be cancerous, a biopsy is the definitive method for diagnosis to determine if the lesion is malignant or benign. The procedure involves removing a small sample of the lesion which is examined microscopically for the presence of cancer cells.