Integumentary System

Ch. 5 Part 3

Skin Disorders

• Cancer• Burns

Skin Cancers

• Over 1 million diagnosed each year• Arizonan’s have 3-7x more risk than people in

other states• 3 common types– Melanoma– Basal cell carcinoma– Squamous cell carcinoma

Melanoma

• Most dangerous form of skin cancer• Appears as:– Change in existing mole– Small, dark multicolored spot with irregular

borders, elevated or flat, bleed or form scab– Cluster of shiny, firm, dark bumps– Larger than a pencil eraser

Melanoma

• Benign – not cancerous• Malignant - cancerous

Basal Cell Carcinoma

• Come from cells in stratum basale of epidermis

• Appear on sun-exposed skin as:– Pearly or flesh-colored oval bump with a rolled

border, may develop into bleeding ulcer– Smooth red spot indented in center– Reddish, brown, or bluish black patch of skin on

the chest or back

Basal Cell Carcinoma

Squamous Cell Carcinoma

• Arise from squamous cells of epidermis• Arise from damaged tissue• Appear on sun-exposed skin as:– A firm, reddish, wart-like bump that grows

gradually– Flat spot that becomes a bleeding sore and won’t

heal

Squamous Cell Carcinoma

Symptoms

• Any change in size, color, shape or texture of a mole or other skin growth

• Open or inflamed skin wound that won’t heal• ABCD’S of melanoma– A – asymmetry– B – border– C – color– D – diameter

Burns

• 1st, 2nd, 3rd degree• Named according to severity• 1st degree– Least severe– Redness or discoloration– Swelling and pain– Usually overexposure to sun– Only epidermis is damaged

Burns

• 2nd degree– Affect epidermis and dermis– May blister– Scarring may result– Most painful because nerves are intact but tissue

is damaged– May involve loss of skin function

Burns

• 3rd degree– Worst burn– May look white or charred– Extend through all skin layers – epidermis, dermis,

subcutaneous layer– Severe to no pain depending on nerve damage– Requires skin grafts

Burns