Koebner phenomenon
C2CEFR level
98/100Rarity: very rare
TechnicalRegister
The appearance of new lesions of an existing skin disease along a line of cutaneous trauma such as a scratch or scar.
The linear extension of plaques along a surgical scar demonstrated the Koebner phenomenon in this psoriatic patient.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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