What is the Koebner response?

The Koebner phenomenon describes the formation of skin lesions on parts of the body where a person doesn’t typically experience lesions. This is also known as an isomorphic response. It’s long been associated with skin conditions such as psoriasis and vitiligo.

What diseases have Koebner phenomenon?

People with skin diseases like psoriasis, vitiligo and lichen planus are most at risk for Koebner phenomenon. With this condition, new skin lesions that resemble the skin disease appear on your healthy skin.

Why does Koebner phenomenon occur?

Causes. Doctors aren’t sure what makes your skin respond to an injury with plaques. You can have a Koebner response from anything that changes your skin on the outside or the inside, including: Injuries such as animal bites, stings, burns, cuts, bumps, or rubbed skin.

How can Koebner phenomenon be prevented?

Taking steps to prevent sunburn and other skin injuries may help prevent new lesions from the Koebner response. It is also important to try to avoid scratching. The authors of a 2017 study note that skin trauma from scratching may cause new psoriatic lesions to form.

Is Koebner phenomenon seen in pityriasis rosea?

A rare case of koebnerization in pityriasis rosea may be added to the category IV list.

What rash looks like pityriasis rosea?

The pityriasis rosea rash is similar to the rash seen in other skin conditions, including ringworm of the skin, tinea versicolor, eczema, and psoriasis. A rash similar to pityriasis rosea also can be caused by syphilis and by certain medicines such as antibiotics.

What triggers pityriasis rosea?

The exact cause of pityriasis rosea is unclear. Some evidence indicates the rash may be triggered by a viral infection, particularly by certain strains of the herpes virus. But it’s not related to the herpes virus that causes cold sores. Pityriasis rosea isn’t believed to be contagious.