Why do I itch so much

i tend to itch alot mainly wen it gets warmer outside so bout spring it starts up & I get bumps on my legs & arms that stay for a while ive try itch creams & lotions & they dont help could it possiably b from detergent changing everytime I move ??? or is there another reason as to y its not from sweat cus I dont sweat badly I sweat a lil ?? please help

You might have sensitive skin. Or allergies.