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Copyright © 2005 by Elsevier Inc. All rights reserved. Slide 1
Chapter 6 Diseases and Conditions
of the Integumentary System
Copyright © 2005 by Elsevier Inc. All rights reserved.
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Copyright © 2005 by Elsevier Inc. All rights reserved. Slide 2
Learning Objectives
Explain the functions of the skin. Recognize common skin lesions. Describe how seborrheic dermatitis
affects the skin. Discuss the common causes of
contact dermatitis, atopic dermatitis, and psoriasis.
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Learning Objectives (cont’d.)
Describe the treatment of acne vulgaris. Explain the pathologic course of herpes zoster. Name the etiology of impetigo. Explain why the treatment of cellulitis is important. Cite examples of classifications of fungal infections of
the skin.
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Copyright © 2005 by Elsevier Inc. All rights reserved. Slide 4
Learning Objectives (cont’d.)
List preventative measures for decubitis ulcers.
Name the two most common parasitic insects to infest man.
Describe how infestation can occur. Name two common premalignant
tumors. Differentiate the three types of skin
cancer.
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Copyright © 2005 by Elsevier Inc. All rights reserved. Slide 5
Learning Objectives (cont’d.)
Describe the guidelines for avoiding excessive sun exposure.
List some conditions that are caused by the abnormal development or distribution of melanocytes.
Name some possible causes of alopecia. State the cause of warts. List some of the likely causes of deformed or
discolored nails.
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Copyright © 2005 by Elsevier Inc. All rights reserved. Slide 6
Chapter 6
Lesson 6.1
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Components of the Integumentary System
Skin and accessory organs: Hair Nails Glands Skin layers Dermis Epidermis Subcutaneous layer
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Normal Skin
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Common Skin Condition Symptoms
cutaneous lesions or eruptions pruritis (itching) pain edema (swelling) erythema (redness) inflammation
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A Few Common Skin Lesions
macule plaque cyst pustule scale burrow
papule nodule vesicle crust fissure comedo
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Skin Lesions
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Skin Lesion (cont’d.)
Note the differences between a macule and a papule: Macule: small, flat, circumscribed lesion
of different color than the rest of the skin Papule: a small firm, elevated lesion
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Skin Lesion (cont’d.)
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Skin Lesion (cont’d.)
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Common Diseases of the Skin
Dermatitis Seborrheic dermatitis Contact dermatitis Atopic dermatitis (eczema) Psoriasis
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Common Diseases of the Skin (cont’d.)
Note the differences between seborrheic dermatitis and contact dermatitis: seborrheic dermatitis – idiopathic
condition resulting in overproduction of sebum
contact dermatitis – localized redness and swelling caused by an irritant or allergen
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Copyright © 2005 by Elsevier Inc. All rights reserved. Slide 17
Common Diseases of the Skin (cont’d.)
Acne vulgaris: an inflammatory disease of the sebaceous glands and hair follicles
Herpes zoster (shingles): an acute inflammatory dermatomal eruption of painful vesicles
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Common Diseases of the Skin (cont’d.)
Chickenpox is a precursor to shingles. Both are caused by the herpes
varicella-zoster virus.
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Chapter 6Lesson 6.2Chapter 6
Lesson 6.2
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Common Diseases of the Skin (cont’d.)
Impetigo: contagious, superficial skin infection
Cellulitis: acute, diffuse, bacterial infection of the skin and subcutaneous tissue
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Dermatophytoses
Tinea capitis Tinea corporis (ringworm) Tinea unguium Tinea pedis (athlete’s foot) Tinea cruris (jock itch)
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Chapter 6Lesson 6.3Chapter 6
Lesson 6.3
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Copyright © 2005 by Elsevier Inc. All rights reserved. Slide 23
Other Diseases of the Skin
Decubitis ulcers (bed sores): localized areas of dead skin
Scabies: infestation by parasitic insects called itch mites
Pediculus: infestation by lice; wingless parasites that feed on human blood
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Other Diseases of the Skin (cont’d.)
Species that infest the head and body Pediculus humanus capitis – lice that
infest the head Pediculus humanus corporis – lice that
infest the body Phthirus pubis – pubic lice (crabs) Sarcoptes scabiei – itch mites
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Benign Tumors
Seborrheic keratosis: benign growths originating in the epidermis
Dermatofibroma: benign, asymptomatic growths that can be found anywhere on the body
Achrochordon (skin tag): common benign skin growths found mainly on the axilla, neck, and inguinal areas of the body
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Copyright © 2005 by Elsevier Inc. All rights reserved. Slide 26
Premalignant Tumors
Actinic keratosis: common pre-malignant lesions found on sun-exposed areas of the body
Indications: an area of rough, vascular skin, which later forms a yellow crust.
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Skin Carcinomas
Non-melanoma skin cancers Basal cell carcinoma (BCC) Squamous cell carcinoma (SCC)
Malignant melanomas The ABCs of malignant melanoma:
A = asymmetry B = border C = color D = diameter
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Protection of Skin from the Sun
Avoid exposure 10 a.m.– 3 p.m. Plan outdoor activities for early
morning or late afternoon Wear protective clothing Use sunscreen
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Abnormal Skin Pigmentation
albinism: inability to produce melanin (inherited)
vitiligo: pale, irregular patches (may be an immune system disorder)
melasma (chloasma): patches of darker skin on the face
hemangiomas: benign lesions of highly vascularized skin; they may be flat (port-wine stains), elevated, or protuberant
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Abnormal Skin Pigmentation (cont’d.)
nevi (moles): small, dark collections of melanocytes seborrheic warts: patches of darkly pigmented skin
with crusty, greasy-looking surface pityriasis: fungal infection; causes patches of flaky,
light, or dark skin on the trunk abnormal suntan: unusual darkening of the skin
resulting from properly used medications
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Copyright © 2005 by Elsevier Inc. All rights reserved. Slide 31
Chapter 6
Lesson 6.4
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Causes of Alopecia (Baldness)
heredity aging process systemic illness dermatitis
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More Common Diseases of the Skin
Verrucae (warts): warts are elevated growths of the epidermis that result from hyperplasia
Deformed or discolored nails: any unusual thickening, color variation, or change in shape of fingernails or toenails