Hi, I recently just noticed two lumps under the skin..it is not painless, it hurts like a bruise when i press on them (it feels kind of like a bump...not any particular shape or anything but its under there) theres one on my shin somewhere and my left forearm..on top a couple inches below my wrist. what could this be? you can't tell visually if its there or not but you can feel it if you rub across my arm. thx btw do bruises ALWAYS appear to look gray/blue? or can bruises be invisible also (the smaller ones)