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Dermatology (Morphology (Primary lesions (Wheal(구반) (a sharply…

- - - - macule <1cm; patch(반) >1cm
      - Lentigo : macule+patch
    - - dermal vasodilation causing redness of the skin
      - Diascopy - 슬라이드 글라스로 눌렀을 때 색깔 변함.
    - - small, solid, elevated lesions up to 1cm in diameter associated w/ cell infiltration
      - superficial folliculitis, scabies, flea bites
    - - bulla >1cm; vesicle <1cm
      - occur in viral or autoimmune dermatoses, or in dermatitis caused by irritants.
    - - a sharply circumscribed, raised lesion consisting of edema that usually appears and disappears within minutes or hours
      - usually produce no changes in appearance of overlying skin and haircoat. Wheals are characteristically white to pink elevated ridges or round edematous swellings that only rarely have pseudopods at their periphery.
      - They blanch on diascopy. A huge hive of distensible region such as lips or eyelids is called angioedema.
  - - - loss of hair and may vary from partial to complete
      - It may be primary, such as alopecia w/ endocrine disorders and follicular dysplasia, or it can occur secondary to trauma or inflammation.
      - hypotrichosis, defluxion/effluvium, easy epilation
    - - an accumulation of loose fragments of the horny layer of the skin. The corneocyte is the final product of epidermal keratinization.
      - may be primary lesion in some cases of color dilution alopecia, follicular dysplasia, primary idiopathic seborrhea, and ichthyosis.
      - common secondary lesions in chronic inflammation
    - - composed of cells and dried exudates. It may be serous, sanguineous, purulent, or mixed.
      - Dark crusts : hemorrhagic, traumatic, furunculosis
      - Honey-colored crusts : infectious
      - Thicker dry yellow crusts : scabies, zinc-responsive
      - Tightly adherent crusts : zinc-responsitve dermatosis, necrolytic migratory erythema, seborrhea
  - - - a linear cleavage into epidermis or through epidermis into dermis caused by dz or injury
      - may be single or multiple tiny cracks or large several centimeters long.
      - They have sharply defined margins and may be dry or moist and straight, curved, or branching. They occur when skin is thick and inelastic and then subjected to sudden swelling from inflammation or trauma, especially in regions of frequent movement. Examples are found at ear margins, and at ocular, nasal, oral, and anal mucocutaneous borders.