Z C Venables1, S S Swart2, C S Soon3. 1. Dermatology Department, Leicester Royal Infirmary, Leicester, UK. zoevenables@hotmail.co.uk. 2. Haematology Department, Northampton General Hospitals NHS Trust, Cliftonville, Northampton, NN1 5BD, UK. 3. Dermatology Department, Leicester Royal Infirmary, Leicester, UK.