A rash was a symptom of eczema suggested by Elton Pope. (TV: Love & Monsters)
The Thirteenth Doctor obtained synthetic intelligent collagen from Titan to cure Graham O'Brien's rash. (PROSE: Combat Magicks)
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Upon hearing of the Doctor's main alias, a human identifying himself as one of the UB60,000,000 mentioned a "really nasty rash" on his back in the hopes that he could help. (NOTVALID: Untitled)