Following his diagnosis in 2010, Mickelson started undergoing treatment. A biologic called Enbrel (a formulation of etanercept) proved effective in controlling his condition.

However, Mickelson will have both psoriasis and psoriatic arthritis for the rest of his life. Sometimes PsA will flare up and other times it will cause minor pain or disability.

Pro golfer Phil Mickelson recently announced that he is being treated for psoriatic arthritis.

The list price for ENBREL is $1,762.34 per weekly 50 mg dose. *,† For patients with moderate to severe plaque psoriasis, the recommended dose is 50 mg twice weekly for the first 3 months followed by 50 mg weekly thereafter. Most patients do not pay the list price.

Mickelson's absence follows his comments on Saudi Arabia and the PGA. Mickelson has withdrawn from the public eye since Feb. 22, when he issued statements via Instagram and Twitter apologizing for controversial comments he made about the PGA and Saudi Arabia and saying that he needed "some time away."

Psoriatic arthritis is a type of arthritis linked with psoriasis, a chronic skin and nail disease. Psoriasis causes red, scaly rashes and thick, pitted fingernails. Psoriatic arthritis is similar to rheumatoid arthritis (RA) in symptoms and joint swelling (inflammation). But it tends to affect fewer joints than RA.

But Enbrel comes with a high price tag. According to its manufacturers, Wyeth Pharmaceuticals, the drug will cost about £10,000 a year per patient, compared with the UK's current £1,000 annual average for rheumatoid arthritis medicines.

For treating plaque psoriasis in adults, the typical Enbrel starting dosage is a 50-mg injection twice per week for 3 months.

He's a big-time gambler, and big-time gamblers make big bets. It's his money to spend how he wants.” Walter estimates Mickelson lost about $100 million while betting more than $1 billion over the past three decades.

Psoriatic arthritis can cause pain and swelling along the bones that form the joints. This is caused by inflammation in the connective tissue, known as entheses, which attach tendons and ligaments to the bones. When they become inflamed it's known as enthesitis.

People with PsA are 43% more likely than those who don't have it to have a heart attack and 22% more likely to have a stroke, according to a 2017 study in Arthritis Care & Research. Controlling PsA with medication may help reduce these risks, but some PsA meds are more effective than others for cardiovascular issues.

For adult patients, step-down dosing is recommended: Starting Dose: ENBREL 50 mg twice weekly for 3 months* Maintenance Dose: ENBREL 50 mg once weekly after 3 months. Starting doses of ENBREL 25 mg or 50 mg per week were also shown to be efficacious.