Why does my skin hurt?

[inksmudge]

Sometimes I notice a patch of skin that's painful to the touch. It's most often on my arms, but it's also happened on my legs, back, and stomach. When inspecting the skin that hurts, it looks completely normal. Nothing is there to distinguish it from the rest of my skin: the texture is normal, there's no discoloration, and I haven't injured it. It just is painful to touch. It sort of feels like the way your skin hurts when you have a really bad case of the flu, except in small patches only 3 inches long maximum, and you're not sick. Or like you've rubbed sandpaper over one place for ten minutes. It's mostly only sensitive to touch, but I've noticed that cold against the skin is can be very uncomfortable as well. If I don't touch it and there are no temperature changes, there is no pain. It usually takes 2-3 days for a sensitive patch of skin to return completely to normal. I haven't noticed anything that triggers new patches to pop up; it seems to happen randomly. What could this be?

Extra things that may or may not be relevant: I'm prone to frequent stabbing pains anywhere on my body that have no apparent cause (phantom pains???), today two new patches of painful skin popped up, both of my feet and shoulder have been twitching on and off all day today, and I see stars on a regular basis all day every day that we initially were told were ocular migraines but probably aren't.

Thank you in advance. =)