How to treat swelling and redness in legs due to psoriasis?

Condition analysis:
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.

Instructions:
1. Eat healthfully
Diet may play a role in managing psoriasis. Eliminating red meat and fatty snacks may help reduce flare-ups that can be triggered by such foods. Cold water fish, seeds, nuts, and omega-3 fatty acids are known for their ability to reduce inflammation. This can be helpful for managing psoriasis symptoms. Olive oil may also have soothing benefits when applied topically to the skin. Try massaging a few tablespoons on your scalp to help loosen troublesome plaques during your next shower. 

2. Warm baths for itch relief
Hot water may be an irritant for your skin. However, a lukewarm bath with Epsom salt, mineral oil, milk, or olive oil can soothe the itching and infiltrate scales and plaques. Moisturize immediately after your bath for double benefits.

3. Light therapy
During light therapy, a doctor will shine ultraviolet light on the skin. This type of therapy often requires consistent and frequent sessions. It should be noted that tanning beds are not a means of achieving light therapy. Too much sunlight can actually worsen psoriasis. This procedure should always be done under the supervision of your doctor.