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Can psoriasis develop around the site of an injury? Yes. If you have psoriasis, lesions have been known to occur on parts of skin that have been injured. This may include areas of scrapes and scratches, sunburns, or places where you've received a vaccination. This tendency for psoriasis to appear around injured areas of skin is called the Koebner phenomenon. Injuries don't act as a "trigger" for everyone who has psoriasis; nevertheless, this phenomenon presents another good reason why you should resist picking and scratching at psoriais lesions.