G J Parkins1, K M Brennan2, G Wylie3. 1. Department of Dermatology, Dermatology Out-patients, Southern General Hospital, Alan Lyell Centre for Dermatology, Glasgow, UK. parkins38@hotmail.co.uk. 2. Department of Neurology, Carver College of Medicine, University of Iowa, Iowa, IA, USA. 3. Department of Dermatology, Dermatology Out-patients, Southern General Hospital, Alan Lyell Centre for Dermatology, Glasgow, UK.