The staff at the National Museum of Health and Medicine in Washington DC have uploaded to Flickr a large collection of
photos from its archives available under a Creative Commons license. This is an example of dermatographic urticaria from the year 1945:
"
Dermographia on a patient's back. This is not a scar; the raised marks are caused by scratches or irritation to the skin and aren't permanent."
Related reading:
Flickr user: "I have a weird allergy called "Dermatography" where the skin welts up from contact"
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