Glossary of terms: U

was formed in February 2002 with the aim of conducting high quality, multi-centre clinical trials that answer questions of importance to clinicians and patients. It involves a collaborative network of dermatologists, dermatology nurses, health services researchers and patients throughout the UK and Southern Ireland.

this is used both in diagnosis and treatment. High resolution ultrasound equipment has an increasing role in the diagnosis of rheumatic disorders and its value as a treatment tends currently to be underestimated in the UK.

the part of light that can be used to treat psoriasis but can also cause sunburn.

• UV-A - Ultraviolet light with wavelengths ranging from 320 to 400 nm
• UV-B - Ultraviolet light with wavelengths ranging from 290 to 320 nm