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BMJ 2009; 339 doi: (Published 11 November 2009) Cite this as: BMJ 2009;339:b4557
  1. Vishal Madan, specialist registrar
  1. 1Dermatology Centre, Salford Royal Hospitals Foundation Trust, Salford, Manchester M6 8HD
  1. vishalmadan{at}

    A 68 year old woman presented with a mottled, purple-red eruption on her forehead, temples, and left parietal scalp, which was triggered when she lowered …

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