primary and secondary skin lesions
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| Circumscribed, flat area with a change in skin color; less than 1 cm in diameter (freckles, petechiae, measles, flat mole(nevus)) | macule
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| elevated, solid lesion; less than 1 cm in diameter (wart(verrucal), elevated moles) | papule
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| circumscribed, superficial collection of serous fluid; less than 1 cm in diameter (varicella, herpes zoster, second-degree burn) | vesicle
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| circumscribed, elevated superficial, solid lesion; greater than 1 cm in diameter (psoriasis, seborrheic and active keratoses) | plaque
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| firm, edematous, irregularly shaped area; diameter variable (insect bite, urticaria) | wheal
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| elevated superficial lesion filled with purulent fluid (acne, impetigo) | pustule
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| linear crack or break from the epidermis to dermis; dry or moist (athlete's foot, cracks at corner of the mouth) | fissure
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| excess, dead epidermal cells produced by abnormal keratinization and shedding (flaking of skin after a drug reaction or scarlet fever) | scale
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| abnormal formation of connective tissue that replaces normal skin (surgical incision or healed wound) | scar
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| loss of the epidermis and dermis; crater-like; irregular shape (pressure ulcer, chancre) | ulcer
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| depression in the skin resulting from thinning of the epidermis or dermis (aged skin, striae) | atrophy
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| area in which epidermis is missing, exposing the dermis (scabies, abrasion, or scratch) | excoriation
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