causes psoriasis rash outbreak
Psoriasis typically starts or worsens because of a trigger that you may be able to identify and avoid. Factors that may trigger psoriasis include: 1  Infections, such as strep throat or skin infections. 2  Injury to the skin, such as a cut or scrape, bug bite, or a severe sunburn. 3  Stress. 4  Cold weather. 5  Smoking. 6  Heavy alcohol consumption.