In contrast, scratching or picking the scalp can worsen the condition. Dermatitis is seen as a a rapidly spreading reddish rash which may be itchy, swollen and blistered. Atopic dermatitis relates to hay and asthma fever-type allergies, and sometimes appears in early childhood often. Contact dermatitis is usually caused by contact with irritants or allergens . People with chronic dermatitis could have a longstanding history of irritation in the affected areas or region.Nehal Mehta, a scientific investigator with the U.S. National Heart, Lung, and Blood Institute. His team also discovered that even mild psoriasis might indicate an increased risk for coronary attack and stroke. Just one psoriasis skin patch, or plaque, might be biologically active, causing low-grade inflammation and starting a cascade, speeding up their blood vessel disease, Mehta said. People really should know that psoriasis is not just a cosmetic disease, he added. However, these scholarly research findings only show an association between psoriasis and bloodstream vessel inflammation, not really a direct cause-and-effect romantic relationship, Mehta said.