persistent - adj. existing for a long time

characteristic - adj. typical of a person, thing, or group : showing the special qualities or traits of a person, thing, or group

inflammation - n. a condition in which a part of your body becomes red, swollen, and painful

scar - n. a mark left on the skin after a wound heals

symptom - n. a change in the body or mind which indicates that a disease is present

unique - adj. belonging to or connected with only one particular thing, place, or person

blood clot - n. a thick and sticky clump of dried blood that stops blood from flowing through a blood vessel in a person or an animal

nuclei - n. biology : the central part of most cells that contains genetic material and is enclosed in a membrane
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