1) Dermatographia 
condition where writing on skin causes red mark to form
a condition in which pressure or friction on the skin gives rise to a transient raised usually reddish mark so that a word traced on the skin becomes visible.
<dermatology> A condition in which pressure or friction on the skin gives rise to a transient raised usually reddish mark so that a word traced on the skin becomes visible. ... (18 Nov 1997) ... 
autogram, autographism, dermographia, dermographism The marking of the skin, usually in red, white, or black wheals. It is most often seen after rubbing the skin frimly with a blunted point
dermatographia.