my 8 yo son has a rash that started thursday (today is sunday). red splotches, some very slightly raised. the splotches are not uniformly shaped and up close, look like a patch of pin pricks. they re on his trunk, below the neck and above the belly button. today, we noticed it s spread to his back. it is not itchy and does not bother him in the least. i m simply curious, what could it be?