Hello, welcome 1. Psoriasis is skin disease in which skin becomes scaly and patchy. Itching is also symptom of this. It is bit complicated disease which takes long treatment course 2. I am surprised and bit shocked that doctor is giving you steroid ( prednisolone injections) for psoriasis condition which is totally wrong treatment. 3. Due to high doses of injection there is interference of kidney functions and retention of water in lower extremities. kINDLY get the kidney function test done to assess the effect of steroids 4. It is very very common side of steroids. swelling will go off slowly slowly 5. I see 4-5 case of psoriasis every day but i never ever give steroids to them. As it has lot of side effects one of them your husband got other than this steroids can cause pustular psoriasis or further worse the psoriasis. 6. Stop the injections immediately 7. Start methotrexate 5-10mg once in week and folic acid rest of the day. This medicine needs proper guidance like liver function test, kidney funtion test, CBC 8. I very frequently give methotrexate to psoriasis patients and get very very good results.