Here are some ...: Without detailing the onset, degree, duration, evolution, progress, & resolution of the thick lines and their associated symptoms over time, it's hard to come up with right answer. But, the limited described brief features may suggest the occurrence of dermatographism - possibly related with urticaria of various origins, hives, etc. Having a direct look at & feel on them will help to deduce Dx....
Answered 3/22/2015
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