1. Chapter 16 Lesson 16.3 psoriasis scabies scleroderma
systemic lupus erythematosus (SLE)
tinea
vitiligo
acne
burns
cellulitis
eczema
exanthematous viral diseases
gangrene
impetigo
fungal tests
Mohs surgery
skin biopsy
skin test
bacterial analyses
cryosurgery
curettage
eletrodesiccation
Journal entry: List as many skin disorders as you can.

2. Objectives
Describe lesions, symptoms, and pathological conditions that relate to the skin.
Identify laboratory tests, clinical procedures, and abbreviations that pertain to the skin.
Apply your new knowledge to understanding medical terms in their proper contexts, such as medical reports and records.

3. Skin Neoplasms — Benign
Callus
Keloid
What is a callus? (increased growth of cells in keratin layer of epidermis due to friction against skin)
What is a keloid? (hypertrophied, thickened scar after trauma or surgery)
Ask for student examples of places that commonly develop calluses. Why?
Some people who are prone to keloids are discouraged from having their ears pierced.

4. Skin Neoplasms — Benign (cont’d)
Keratosis: thickened area of epidermis
Leukoplakia: white thickened patches on tongue or cheek
Nevus: pigmented lesion
Verruca: warts caused by virus
Have students find images for abnormalities not shown in the text. Images are very useful for remembering these conditions.

5. Skin Neoplasms — Cancerous
Basal cell carcinoma
Malignant tumor of the basal cell layer of the epidermis
Refer back to the chapter that included AIDS.
Why are AIDS patients susceptible to this condition?
Why does it rarely occur in the rest of the population?

6. Skin Neoplasms — Cancerous (cont’d)
Squamous cell carcinoma
Malignant tumor of the squamous epithelial cells of the epidermis.
Refer back to the chapter that included AIDS.
Why are AIDS patients susceptible to this condition?
Why does it rarely occur in the rest of the population?

7. Skin Neoplasms — Cancerous (cont’d)
The ABCDs of malignant melanoma.
A. Asymmetry
B. Border, irregular or circumscribed
These skin tumors often metastasize to the lung, liver, bone, and brain. What is the current treatment for this type of cancer?
Squamous cells can grow wherever there is squamous epithelium (internal or external). Common places include the mouth, larynx, bladder, esophagus, and lungs. Some are cigarette-related.
Why are healthy organs lined with squamous cells in the first place? What about this tissue makes it appropriate for those particular organ systems?
D. Diameter, usually larger than 6mm
C. Color variation

8. Skin Neoplasms — Cancerous (cont’d)
Kaposi sarcoma
Malignant, vascular, neoplastic growth characterized by cutaneous nodules.
Refer back to the chapter that included AIDS.
Why are AIDS patients susceptible to this condition?
Why does it rarely occur in the rest of the population?

9. Laboratory Tests Bacterial analyses: pus or fluid
samples examined to detect
microorganisms
Fungal tests: scrapings for culture and
microscopic examination after
treatment with KOH

10. Clinical Procedures Cryosurgery: destroy tissue with
subzero temperatures using liquid
nitrogen
Curettage: scrape lesion with sharp
curet
Electrodesiccation: destroy tissue by
burning with electric spark
For what conditions is electrodesiccation recommended?

11. Clinical Procedures (cont’d)
Mohs surgery: remove thin layers of
growth to examine under microscope
(basal and squamous cell)
Skin biopsy: punch and shave to
remove for examination in path lab
Skin test: test reaction of body to
allergen with skin test (scratch or patch tests)
Discuss how some of the surgeries are for both diagnosis and treatment. Removal is done whether or not the physician knows that the lesion is cancerous.
All suspicious-looking tissues removed from the body are sent to the pathology lab for analysis. Why?

12. Abbreviations
ABCDE asymmetry, border, color, diameter, evolution (or change) —characteristics associated with melanoma
bx biopsy
Derm. dermatology
DLE discoid lupus erythematosus
PPD purified protein derivative
PUVA psoralen-ultravoilet A light therapy
SLE systemic lupus erythematosus
SC subcutaneous
Ask students to provide the full terms for these abbreviations.

13. Review Sheet (cont’d) adip/o fat albin/o white caus/o burn, burning
COMBINING FORMS
adip/o fat
albin/o white
caus/o burn, burning
cauter/o heat, burn
cutane/o skin
derm/o skin
Combining Form Meaning

14. Review Sheet (cont’d) dermat/o skin diaphor/o profuse sweating
COMBINING FORMS
dermat/o skin
diaphor/o profuse sweating
erythem/o redness
erythemat/o redness
hidr/o sweat
ichthy/o scaly, dry
Combining Form Meaning

15. Review Sheet (cont’d) kerat/o hard, horny tissue leuk/o white
COMBINING FORMS
kerat/o hard, horny tissue
leuk/o white
lip/o fat
melan/o black
myc/o fungus
onych/o nail
Combining Form Meaning

16. Review Sheet (cont’d) phyt/o plant pil/o hair, hair follicle py/o pus
COMBINING FORMS
phyt/o plant
pil/o hair, hair follicle
py/o pus
rhythid/o wrinkle
seb/o sebum
squam/o scale-like
Combining Form Meaning

17. Review Sheet (cont’d) steat/o fat trich/o hair ungu/o nail
COMBINING FORMS
steat/o fat
trich/o hair
ungu/o nail
xanth/o yellow
xer/o dry
Combining Form Meaning

18. Review Sheet (cont’d) -algia pain -derma skin -esis condition
SUFFIXES
-algia pain
-derma skin
-esis condition
-lysis breakdown; separation; destruction; loosening
-ose full of; pertaining to; sugar
Suffix Meaning

19. Review Sheet (cont’d) -osis condition, usually abnormal
SUFFIXES
-osis condition, usually abnormal
-ous pertaining to
-plakia plaque
-plasty surgical repair
-rrhea flow; discharge
Suffix Meaning