Pathological terms
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| lesion | Wound, damage, or injury to the skin.
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| vascular lesion | Lesion in a blood vessel that shows through the skin.
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| macule | Small, flat, noticeably colored spot on the skin.
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| patch | Small area of skin differing in color from the surrounding area.
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| papule | Solid elevation on the skin.
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| nodule | Small knob of tissue
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| plaque | Small area of skin differing in color from the surrounding area; buildup of solid material, such as a fatty deposit, on the lining of an artery.
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| polyp | Bulging mass of tissue that projects outward from the skin surface.
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| pediculated polyp | Polyp that projects upward from a slender stalk
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| sessile polyp | Polyp that projects upward from a broad base.
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| tumor | Any mass of tissue; swelling
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| wheal | Itchy patch of raised skin
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| bulla | Bubble-like blister on the surface of the skin.
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| pustule | Small elevation on the skin containing pus.
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| vesicle | Small, raised sac on the skin containing fluid
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| cyst | Abnormal sac containing fluid.
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| pilonidal cyst | Cyst containing hair usually found at the lower end of the spinal column.
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| sebaceous cyst | Cyst containing yellow sebum.
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| erosion | Wearing away of the surface of the skin, especially when caused by friction.
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| excoriation | Injury to the surface of the skin caused by a scratch, abrasion, or burn, usually accompanied by some oozing.
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| fissure | Deep slit in the skin; deep furrow or slit (as in bone); one of many indentations of the cerebrum; sulcus.
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| ulcer | Open lesion, usually with superficial loss of tissue.
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| decubitus, decubitus ulcer | chronic ulcer on skin over bony parts that are under constant pressure; pressure sore.
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| pressure ulcer | Chronic ulcer on skin over bony parts that are under constant pressure
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| scale | Small plate of hard skin that falls off.
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| keloid | Thick scarring of the skin that forms after an injury or surgery.
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| crust | Hard layer, especially one formed by dried pus, as in a scab
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