Overview
Psoriasis is a chronic inflammatory skin disease affecting around two percent of the population in Germany. It is not contagious and typically progresses in flares: phases with pronounced skin changes alternate with calmer periods. It is characterised by sharply demarcated, reddened plaques with silvery-white scaling, preferentially on the elbows, knees, scalp and lower back. Nails and joints can also be involved. Because the appearance of psoriasis is usually very typical, the condition is well suited to a telemedical assessment: on the basis of clear photos, the doctor can evaluate the findings and, subject to medical assessment, initiate a topical therapy. If the diagnosis is already established, an established treatment — for example with corticosteroid preparations or vitamin D3 analogues — can be continued via a follow-up prescription, without waiting for an appointment at a dermatology practice. Treatment is billed as a private service according to the GOÄ fee schedule for privately insured and self-paying patients.
Common causes
Psoriasis is based on a genetic predisposition that leads to a dysregulation of the immune system: skin cells renew themselves much faster than usual, producing the typical scaling and inflammation. Whether and when flares occur depends on individual triggers. Common triggers include emotional and physical stress, infections — particularly streptococcal infections of the respiratory tract —, skin injuries such as scratches, friction or sunburn (the so-called Koebner phenomenon), as well as alcohol and smoking. Certain medications can also worsen or trigger psoriasis; therefore, always mention all medicines you take during the consultation. Cold, dry winter climate aggravates the symptoms in many patients, while sunlight and humid air often improve them. Hormonal changes and excess weight can additionally influence the course. Knowing your personal triggers is an important building block of long-term treatment.
When to see a doctor
A medical assessment is advisable if skin changes appear for the first time and the diagnosis is not yet confirmed, if existing plaques spread or no longer respond to the current therapy, or if itching or visible lesions significantly impair your quality of life. Treatment should also be medically supervised in the case of nail changes or involvement of sensitive regions such as the face, genital area or skin folds. If joint pain, morning stiffness or joint swelling additionally occur, assessment for psoriatic arthritis is important, as early treatment can prevent joint damage. Warning signs of an emergency are extensive reddening of almost the entire skin, rapidly increasing pus-filled blisters with fever or chills, and a pronounced feeling of illness with circulatory problems — in these cases, call the emergency number 112 immediately.