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Psoriasis is a disease of unknown etiology. Contrary to appearances, it is not related to psoriasis. Find out what characterizes this obscure dermatological condition.

Psoriasis is a disease that has nothing to do with psoriasis. There are several types of it, and depending on the changes occurring, a different treatment is applied. What is the characteristic of psoriasis? Is it dangerous?


  1. Psoriasis - types
  2. Przyłuszczyca - comparison of small focal length and large focal length
  3. Psoriasis - differential diagnosis
  4. Psoriasis - diagnosis
  5. Psoriasis - treatment

Psoriasis - types

  • Small-focal (finger) plaque psoriasis

This is a chronic skin disease with elongated (finger) erythematous lesions on the trunk and limbs. The changes are clearly demarcated and last for many years. The disease does not require treatment, there is improvement after solar irradiation or PUVA, but it is not constant.

  • Multifocal (inflammatory) plaque psoriasis

It is characterized by extensive erythematous, exfoliating foci well demarcated from the environment. The lesions are more common in middle-aged men and are located on the torso and limbs. Within them, fungal granulomas can develop. When this happens, deeper infiltrates and itching appear.

  • Multifocal (polyodermic) plaque psoriasis

Discoloration, telangiectasias, tissue atrophy of the skin are specific to this type of psoriasis. The changes often turn into malignant neoplasms. When malignant transformation occurs, the itching increases.

Przyłuszczyca - comparison of small focal length and large focal length

under 5 cmover 5 cm
uniform changesvaried changes
round / finger shapeirregular shape
uniform colorspatchy color
poikilodermiaoccursno poikilodermia

Psoriasis - differential diagnosis

The acute form may resemble diseases in which blistering occurs, for example viral infections or a reaction to insect bites. The chronic form can be differentiated, for example, from lichen planus. In this condition, the changes appear suddenly, they are polygonal lumps with a tendency to pooling, accompanied by itching.

Psoriasis - diagnosis

The doctor makes a diagnosis based on the patient's clinical symptoms. Histopathological examination is an important diagnostic test. Its picture varies, depending on the stage of the disease and the size of the lesions. Initially, lymphocytic infiltration with dilated superficial blood vessels can be observed.

Psoriasis - treatment

The main treatment is phototherapy. The appearance of changes can be improved, most often temporarily, thanks to solar or PUVA irradiation. In the case of poikylodermic psoriasis, topical treatment with neutral or glucocorticosteroid ointments is used.

It is very important that patients are under the constant care of a dermatologist. Large-focal psoriasis can lead to mycosis fungoides, although it is a long-term process.

About the authorNatalia MłyńskaStudent of medicine at the Medical University of Lodz. Medicine is her greatest passion. He also loves sports, mainly running and dancing. She would like to treat her future patients in such a way as to see them as a human being, not only a disease.

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