Thanks for writing to the forum!
No, Erythema Multiforme is not contagious, hence you cannot pass it to someone if you touch them. You can read more about it on this link: http://www.nlm.nih.gov/medlineplus/ency/article/000851.htm
Hope this helps. Please let me know if there is any thing else and do keep me posted. Take care!
I think it may be if other touch the clear liquid from the bumps.