tiny itchy bumps on arms

JustAverage

So, for as long as i can remember, i have these pale-than-my-skin(ill just call them white for the sake of time) spots on my arms. They come in patches. they are not raised unless when they are very itchy and i will itch and itch and itch until the tiny white bumps open up and tiny spots of blood appear on top of the mini bumps. i only remember this problem MOSTLY happening during the warmer months. So, naturally, i thought i was photosensitive. so i googled it and it looks nothing like what i have. they never turn red (unless there's scabbed blood as aforementioned) when i really itch, it turns a pale pink(my guess because i itch it constantly) i dont have any food allergies, i have switched lotions, perfumes, and body wash constantly and nothing helps. these bumps are only on my arms. please help. ty