The nature and consequence of Karl Marx’s skin disease

Unfortunately I was not able to get access to the document from here (I will have to login at King's to read the article), but I think this is quite interesting:

From an analysis of the original correspondence, it has been possible to establish that Karl Marx’s incapacitating skin disease was hidradenitis suppurativa, not ‘boils’ as was universally assumed at the time and since; the psychological effect of this illness on the man and his work appears to have been considerable.

Article