Primary & Secondary Lesions
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| Flat, unelevated change in color. 1mm-1cm in size and circumscribed. | Macule
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| Flat, unelevated change in color. Larger than 1cm and may have an irregular shape. | Patch
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| Circumscribed, solid elevation of the skin. Less than 1cm. | Papule
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| Larger than 1cm. Ex Psoriasis, Rubeola | Plaque
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| Elevated, solid, hard mass that extends deeper into the dermis than a papule. It has a circumscribed border and are 0.5-2cm. | Nodule
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| Elevated, solid, hard mass that extends deeper into the dermis than a papule and is larger than 2cm. May have an irregular border. | Tumor
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| A circumscribed, round or oval, thin translucent mass filled with serous fluid or blood. Less than 0.5cm | Vesicle
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| A circumscribed, round or oval, thin translucent mass filled with serous fluid or blood. Larger than 0.5cm | Bulla
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| Vesicle or Bulla filled with pus. | Pustule
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| A 1cm or larger, elevated, encapsulated, fluid-filled or semisolid mass arising from the subcutaneous tissue or dermis. | Cyst
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| A reddened localized collection of edema fluid: irregular in shape. Ex. would be an allergic reaction. | Wheal
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| Dry blood, serum, or pus left on the skin surface when vesicles or pustles burst. Can be red-brown, orange, or yellow. | Crust
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| Linear crack with sharp edges, extending into the dermis. | Fissure
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| Flat, irregular area connective tissue left after a lesion or wound has healed. | Scar
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| Elevated, irregular, darkened area of excess scar tissue caused by excessive collagen formation during healing. | Keloid
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