The condition is named after Heinrich Koebner, the scientist who discovered it in 1876.
Koebner’s is often experienced by people with skin conditions like psoriasis, vitiligo, and lichen planus.
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What Is Koebners Phenomenon?
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The rash can show up anywhere on the body where trauma to the skin has occurred.
Koebner’s phenomenon looks like raised skin lesions.
The lesions tend to have the same features as a persons existing dermatologic condition.
Although Koebners phenomenon occurs after skin trauma, it is not an acute condition.
Rather, it activates an underlying disease.
People with preexisting skin conditions are most susceptible to Koebners phenomenon.
Psoriasis
Psoriasisis an autoimmune disorder in which the body attacks normal skin cells.
A 2011 study found that 28% of participants with existing psoriasis developed Koebners phenomenon aftergetting a tattoo.
Fewer than 7% had a flare-up on other parts of their body.
People with vitiligo may also experience early graying of their hair and itching on the affected skin regions.
Like psoriasis, vitiligo has certain triggers, including stress, sunburn, chemicals, and viruses.
Skin injuries can also trigger Koebnerization.
Lichen Planus
Lichen planusis an autoimmune disease that causes a purple, itchy rash.
The condition can affect many parts of the body, including the inside of the mouth.
Causes
The exact cause of Koebners phenomenon is not known.
True vs. Pseudo Koebner’s Responses
A true Koebners response occurs alongside preexistingautoimmune conditionsthat affect the skin.
Seeing a Dermatologist
If you notice changes in your skin, make an appointment with adermatologist.
A dermatologist will also rule out an infection or allergic reaction.
Frequently Asked Questions
What does Koebners phenomenon look like?
The appearance of Koebners phenomenon depends on which autoimmune condition a person has.
Koebners phenomenon tends to present in the same way as the preexisting condition.
What is an isomorphic response?
An isomorphic response is another term for Koebners phenomenon.
Isomorphic is Greek for equal shape.
The phrase is used because the lesions from Koebners are identical to a persons underlying condition.
How can I prevent psoriasis flare-ups?
Psoriasis tends to flare up if a person encounters specific triggers.
Triggers are different for every person.
Common triggers include stress, skin trauma, dry skin, medications, alcohol, and infections.
A symptom journal may help you figure out what causes your flare-ups.
If any changes develop, contact your doctor or dermatologist.
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