Slide 1: A large, asymmetrical, red and brown melanoma lesion. Image credit: Larry Meyer.

Slide 2: A brown melanoma lesion with a large and irregular border. Image credit: Larry Meyer.

Slide 3: A large, asymmetrical, red and brown melanoma lesion. Image credit: Larry Meyer.

Slide 4: Malignant melanoma. Pigmented papule with asymmetry, irregular border, and red, brown, and black color variation. Image credit: National Cancer Institute (NCI).

Slide 5: Malignant melanoma with halo. Central irregularly pigmented papule is surrounded by a 5-mm rim of depigmentation due to a local immune response. Halo effect can also be seen surrounding benign nevi. Image credit: NCI.

Slide 6: Computed tomography (CT) scan of rib, showing metastasis from melanoma (arrow). Image credit: Peter Choyke.

Slide 7: CT scan of chest wall showing sternal metastasis from melanoma (arrow). Image credit: Peter Choyke.

Slide 8: CT scan of adrenal gland showing metastasis from melanoma (arrow). Image credit: Peter Choyke.

Slide 9: Metastatic melanoma. Numerous pink/purple nodules and eroded plaques are present on the proximal thigh. Image credit: NCI.

Slide 10: Metastatic melanoma. Large eroded plaque on the leg with areas of crust. Scattered eroded dermal nodules are also present. Image credit: NCI.

Slide 11: Metastatic melanoma cells, 320x magnification, H&E stain. Image credit: Lance Liotta.

Slide 12: Basal cell carcinoma, nodular. Flesh-colored nodules on the skin. Image credit: Kelly Nelson.

Slide 13: Superficial basal cell carcinoma. A pink, scaly skin lesion. Image credit: Kelly Nelson.

Slide 14: A red, ulcerated basal cell carcinoma lesion. Image credit: Kelly Nelson

Slide 15: Micrograph of multicentric superficial basal cell carcinoma. Image credit: LWozniak&KWZielinski, Wikimedia Commons.

Slide 16: A pink, raised squamous cell carcinoma lesion. Image credit: Kelly Nelson.

Slide 17: Squamous cell carcinoma. Tends to arise from actinic keratoses, premalignant lesions; surface is usually scaly and often ulcerates (as shown).

Slide 18: Squamous cell carcinoma showing uncontrolled growth of cells. Image credit: Markus Schober and Elaine Fuchs.