Inverse psoriasis

Inverse psoriasis (IP) is also known as intertriginous psoriasis.

Skin lesions appear on skin of color as lesions of purplish, brown or darker than the surrounding skin, in body folds. 

On Caucasian skin it appears as bright red lesions in body folds. 

Many people with inverse psoriasis have a different type of psoriasis elsewhere on the body.

IP sites: armpits, groin, under the breasts and in other skin folds on the body. 

Rubbing and sweating irritates inverse psoriasis because of its location in skin folds and tender areas. 

It usually lacks the scale associated with plaque psoriasis due to the moist environment. 

Inverse psoriasis is more common in obese people and those with deep skin folds.

Common triggers for inverse psoriasis include:

Certain medicines

Starting and stopping medicines


Injury to the skin


Tobacco or alcohol use

Friction on deep skin folds


Treatment options typically include topical treatments or systemic medications for more severe inverse psoriasis.

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