HELP!!!

Grace

i have NO IDEA what this is. i am 15, and about a week ago i was feeling itchy on my skin and little dots like these would occur on the spot i was itching.

im feeling itchy everwhere and ive tried using lotion but then is itchy about 20 min later. here are some pictures from all over my legs and arms

does anyone know what this is and what i can do to fix it?