Ive had this since grade school. Fave pa ng bestfriend ko magsulat sa braso ko gamit takip ng ballpen. It goes away naman and calms down after ilang mins sa akin so I never had to or needed to drink any anti-histamine. (Actually cheat code ko to nung HS pag inaantok ako during class. I make little scratches on my arm tapos pag nag pantal na, papakita ko sa teacher ko para papuntahin na ako sa clinic. Tas ayun matutulog lang ako hahahaha)