Seed ticks are horrible! I have had them bad a few times. Me and my buddy went out this weekend I sprayed down my entire body with off deep woods, he just sprayed his ankles...he got them on his stomach, we went through the same places, i didnt get any. I do have some chiggar bites though. Good Luck with em...dont know really how to treat it.
Oh by the way, a seed tick is tiny tiny tick, about the size of well,,,small...if you were to take a pencil and make a dot on a piece of paper, thats how big they are and they usually get you in like colonies, brush up against one and your in from some itching. Get em bad it looks like your skin is crawling-----ive had them that bad before...crazy, not fun.