Psoriasis

Psoriasis

Psoriasis is a non-contagious, chronic and still incurable skin disease that affects almost 2% of the population. The symptoms can be treated effectively in most cases.
Psoriasis develops when skin cells (keratinocytes) regenerate too fast due to false signals from the immune system, replacing themselves every 3-4 days instead of the usual 28-30 days. These redundant skin cells cause red, scaly, inflamed rashes on the skin (typically they appear on the scalp, the flexural surfaces of the skin, elbow, knees, nails). The rashes are itchy, may bleed, and can be very painful.

The symptoms of the different types of psoriasis:

• Plaque psoriasis (75-80% of the cases): This type is characterized by thickened red skin areas covered by white-silvery scales. It usually appears on the knees, elbows, scalp, behind the ears, the sacrum and navel, between the buttocks and around the genitals.
• Guttate psoriasis (15-20% of the cases): Characterized by drop-shaped, thin scales of different size, most of which are found on the torso and sometimes on the face. 
• Pustular psoriasis (2% of the cases): Usually occurs on older patients. It develops as a new disease or as the relapse of plaque psoriasis. Characterized by reddened skin on the back of the hands and soles. 
• Erythrodermic psoriasis (1-2% of the cases): usually characterized by inflamed spots causing redness on almost the entire body. 

Psoriasis of the scalp (50% of the cases): A type of plaque psoriasis. Inverse psoriasis: usually occurs on the flexural surfaces of the body, wrinkles (e.g., armpits, loin, on the flexural surfaces of the skin of severely obese people). The rashes are usually flat surfaced and red, but not scaly.

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