1. Skin Cancer Can be benign or malignant
The most common factor leading to skin cancer is overexposure to UV radiation in sunlight

2. Basal Cell Carcinoma Least malignant and most common
Affects the basal layer
Spread is so slow that 99% of cases are solved by surgically removing the lesion
(cancer causing)

3. Basal Cell Carcinoma

4. Squamous Cell Carcinoma
Affects the spinous layer
Can rapidly spread to nearby lymph nodes and other healthy tissues/organs
Early detection and surgical removal usually leads to full recovery

5. Squamous Cell Carcinoma

6. Malignant Melanoma Cancer of melanocytes (skin pigments)
Caused by overexposure to the sun
Accounts for only ~5% of skin cancers, but is frequently deadly
Doctors use the ABCD rule for recognizing melanoma

7. ABCD rule A) Asymmetry: the two sides of spot or mole do not match
B) Border irregularity: borders of the lesion are not smooth
C) Color: spot contains different colors (blacks, tans, browns, blues, reds)
D) Diameter: spot is larger than 6 mm in diameter (the size of a pencil eraser)

8. Malignant Melanoma

9. How does our skin change as we age?

10. Developmental Aspects of the Skin
Throughout our entire lives, our skin is constantly undergoing changes

11. Aged Skin Subcutaneous tissue is reduced
Skin becomes drier as sebaceous glands lose function
Collagen and elastin fibers break down, resulting in wrinkles
Hair follicles decline, resulting in thinning of hair and baldness