Symptoms come and go, but some things can trigger them. Stress, strep throat, and certain medications can all cause a flare. Skin injuries like a cut, scratch, or bad sunburn can also bring on symptoms. It isn’t clear if there's a link between food and this disorder. But if your skin gets worse after eating a certain food, you might want to stop eating it for a few weeks and see what happens.
Strep throat; cold, dry weather; and stress are common psoriasis triggers.
Skin injuries -- like a cut, scratch, or bad sunburn -- and certain medications can also cause flares.