A lesion is an injury to the living tissue on your body, like your skin or an organ. Usually a lesion involves a break or wound to the skin, so protect it with a bandage so that it heals quickly.

Lesion, pronounced "LEE-zhun," comes from the Latin word laesionem meaning "injury." Lesions on the skin are usually not very nice to look at, the kind of wounds that might make you grimace — things like open sores, cuts, deep scrapes or puss-filled gashes. Lesions also are a concern of doctors because if lesions develop without explanation, it can be a sign that your immune system is dangerously weak.

Definitions of lesion

n any localized abnormal structural change in a bodily part

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a swelling that is the characteristic lesion of tuberculosis
ulcer, ulceration
a circumscribed inflammatory and often suppurating lesion on the skin or an internal mucous surface resulting in necrosis of tissue
aphthous ulcer
a blister on the mucous membranes of the lips or mouth or gastrointestinal tract
bedsore, decubitus ulcer, pressure sore
a chronic ulcer of the skin caused by prolonged pressure on it (as in bedridden patients)
infectious venereal ulcer
peptic ulcer, peptic ulceration
an ulcer of the mucous membrane lining of the alimentary tract
canker, canker sore
an ulceration (especially of the lips or lining of the mouth)
a cancerous ulcer of soft tissue and bone
acute ulceration of the mucous membranes of the mouth or genitals; often seen in undernourished children
Type of:
any deviation from a healthy or normal condition

n an injury to living tissue (especially an injury involving a cut or break in the skin)

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raw wound
a wound that exposes subcutaneous tissue
marks resembling the wounds on the crucified body of Christ
abrasion, excoriation, scrape, scratch
an abraded area where the skin is torn or worn off
cut, gash, slash, slice
a wound made by cutting
a torn ragged wound
a wound resulting from biting by an animal or a person
a superficial abrasion
rope burn
abrasion (usually on the hands) caused by friction from a rope
dog bite
a bite inflicted by a dog
a bite inflicted by a (venomous) snake
Type of:
harm, hurt, injury, trauma
any physical damage to the body caused by violence or accident or fracture etc.

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