James J. Yun is a Rheumatologist based in Sydney, NSW, Australia.
In day-to-day practice, he looks after people with long-lasting inflammation and immune system issues. Rheumatology can cover more than just joint pain, and this is where many of the referrals come from. At times, the problems can also show up in the skin, with rashes or severe skin reactions that need quick, careful assessment.
Common types of problems seen in this area include conditions like myositis and rhabdomyolysis, where muscle inflammation and muscle breakdown can cause real weakness and discomfort. There are also immune-related blood and clotting issues that may come up, including agranulocytosis and Felty syndrome. Over time, these conditions can be tough to manage, so the focus is usually on finding what’s driving the inflammation and keeping symptoms under control.
He also works with complex allergy-type conditions. This may include asthma alongside immune reactions, and conditions such as Mast Cell Activation Syndrome (MCAS). At times, symptoms can be widespread and can affect the skin and the body in more than one way. When reactions become sudden or severe, James J. Yun can help review the likely cause and guide next steps, including how to stay safe if anaphylaxis is a concern.
Some referrals are about serious skin reactions, including erythema multiforme and Steven-Johnson syndrome, as well as scalded skin syndrome. These are often urgent. The goal is to assess the risk, work out how these episodes are linked to the immune system or medication triggers, and support recovery with a clear plan.
His practice also includes rarer neurological and immune conditions, such as chronic polyradiculoneuritis, and other immune-driven issues. Warts may also be part of the picture in certain immune-related cases.
Training and experience details are not listed here, but the focus of care is practical and steady, especially when symptoms come and go or when people have been dealing with problems for a while. If clinical research options are relevant, they are usually considered alongside standard care, but details about trials are not shown here.