Chapter 6 skin, hair and nails cont.

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definitions of skin lesions

psoriasis

chronic, recurrent dermatosis marked by itchy, scaly, red plaques covered by silvery gray scales

atopic eczema

This rash appears mainly on the flexor surfaces of the skin.

What are the three layers of skin?

Epidermis, dermis, connective tissue

cluster skin lesion pattern

grouped lesions of herpes simplex

serpiginous skin lesion pattern

tinea corporis, appears in snake like pattern

annular, arciform skin lesion pattern

ringworm

macule

small flat spot, upt ot 1.0 cm

patch

flat spots, 1.0 cm or larger

examples of macules

vitiligo, and hemangioma

plaque

elevated superficial lesion 1.0 cm or larger, often formed by coalescensce of papules, example psoriasisi

papule

up to 1.0 cm

nodule

marble-like lesion larger than 0.5 cm, oftern deeper and firmer than a papule

cyst

sac of fluid or semisolid material located in or under the skin

wheal

Elevated irregular shaped area of cutaneous edema ex. insect bites & allergic reactions.

vesicle

papavle elevations with fluid filled cavities. Up to 1.0 cm examples are herpes zoster and simplex

bulla

1.0 cm or larger; filled with serous fluid
examples are insect bites

pustule

filled with pus examples are acne and small pox

burrow

a minute, slightly raised tunnel in the epidermis. example are scabies

scale

a thin flake of dead exfoliated epidermis example echthyosis vulgaris and dry skin

crust

dried residue of skin exudates such as serum, pus or blood. example impetigo

scars

connective tissue that arises from injury or disease

Keloids

Hypertrophic scarring that extends beyond the borders of the initiating injury. ex: keloid- ear lobe

erosions

nonscarring loss of the superficial epidermis; surface is moist but does not bleed

excoriation

Skin sore or abrasion produced by scratching or scraping. example cat scratching

fissure

a linear crack in the skin, often resulting form excessive dryness. example athletes foot

ulcer

a deeper loss of epidermis and dermis; may bleed and scar

What is the most common cutaneous disorder in US?

Acne vulgaris

Melanoma risk factors.

severe sunburn as child, fair skin that freckle or burns easily, year round sun exposure, family hx.

nevi

common mole

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