Hi Welcome to HCM I have gone thru your query regarding Environment and behavior — Environmental and behavioral factors can affect the risk of developing psoriasis or worsen psoriasis. Physical stress, psychological stress, or infections caused by bacteria or viruses can cause flares (worsening) of psoriasis symptoms. Certain medications also can worsen psoriasis symptoms, including beta blockers (eg, propranolol), lithium, and antimalarial drugs (eg, hydroxychloroquine, Plaquenil) Doctors believe that psoriasis is caused by abnormalities in the immune system, enzymes, and other factors that regulate skin cell division. Part of the process involves an abnormal immune response, which causes inflammation and rapid production of immature skin cells. Genes play a role in the development of psoriasis. Researchers have discovered that a variation in a group of genes known as LCE can protect against the condition. One of these genes codes for proteins that help maintain the skin s barrier.` Human monoclonal antibodies bind to proteins or cells and stimulate the immune system to destroy those cells. Your immune system is your defense against invaders . But when the immune system becomes weak, the disease cells can grow out of control , the disease overpowers So you should not ignore other possibilities , that can be constipation , mental stress , worry , anger . All affect our health badly . Our bewildered life style and faulty food habits of nutritious food & lack of exercise are culprits which drag us to sufferings of ill health . Our health depends on what we eat ,when we eat , & how we eat and our life style . Gulping on only medicine & antibiotic will not help cure unless you modify your life style and your food habits . . Along with medical treatment you need to avoid carbs, fried ,fast foods , tea , coffee , alcohol and I will suggest to increase intake of balanced and healthy diet would also go a long way in preventing psoriasis among people . Include protiens , vitamins , mineral in natural form-- fresh fruit , green veges and and supplements full of antioxidents -ginger ,garlic , lemon juice , honey ,fresh coconut water and fish for omega 3 is also great antioxidant , fenu greek powder with water . Aloe vera juice 30 ml + Amla juice 2 spoons , helps kill becteria on mass basis is great antioxidant . . Turmeric powder a level spoon with a cup of hot milk + a spoon of almond oil at bed time serves as great antioxidant . . most important is to clear you bowls . as constipation is mother of all ills . . To strengthen immune response naturally , exercise regularly -- it s a natural anti-inflammatory.For proper blood circulation , regular walk for 30-45 minute for 5 days a weak , exercise , yoga , pranayam-deep breathing , proper rest & sound sleep , massage help, helps in detoxifying and strengthening the immune system to enhance resistance from diseases and pave way for healthy disease free life . Take Homeopathic Psoinum 200 /3 drops in a cup of water / make 3 doses of this mixture . Take all at a gap of 30 mins . Repeat every 15 days for 6 months Take Nux Vomica 30 / twice a day /for a week --then once /in the evening for .2 month Hope this helps solves your query .Take care .All the best Don t hesitate to come with further query if you have any .