C86.6: Primary cutaneous CD30-positive T-cell proliferations

Primary cutaneous CD30-positive T-cell proliferations refer to a group of rare skin disorders that involve an abnormal increase of specific immune cells, known as CD30-positive T cells, in the skin. These disorders typically present as solitary or multiple skin nodules, bumps, or patches that can be red, brown, or purple. They can occur anywhere on the skin, though they most commonly affect the trunk and the limbs. Symptoms may include itching, pain, or discomfort in the affected areas. These conditions are non-contagious as they are caused by the body's own immune system producing an excess of these cells, but the exact cause is unknown. Over time, these skin changes may remain stable, spontaneously resolve, or evolve, with some cases progressing to more aggressive lymphomas. Early detection is crucial as it can affect the course and treatment of these diseases.