 [ Symptoms ] i have two large lumps on the outside of my knee   one above and one below the one above is extremely painful on 4 separate occasions about 2 months ago i had to get on my knees for chores and each time i experience a very sharp pain on the lower outside area of my right knee with each instance being more painful than the last the pain prevents me from spending any time on my feet i have severe inflamation and shooting pains that have a distinct burning and stinging sensation i also have a very large hard knot above my knee to the outside and one below my knee on the outside [ Disease ] psoriatic arthritis is an inflammatory disease that affects the joints the presence of inflammatory arthritis with a history of psoriasis makes the psoriatic arthritis diagnosis more likely because this form of arthritis can cause deformity and crippling just like rheumatoid arthritis it is important to have an accurate psoriatic arthritis diagnosis and treat the disease early and effectively psoriatic arthritis usually strikes around age 30 to 50 equally affecting both men and women but it may also start in childhood the skin disease precedes the arthritis in nearly 80 of patients psoriatic arthritis may precede psoriasis in up to 15 of patients some people may have both at the same time