lat injury

Im sorry this is kinda a n00b question but i need to know

On wednesday I did back, I did wide grip lat pull down, underhand should width grip lat pull down, and v bar lat pull down
each 3 sets of 12.

So yesterday i was a little sore from the day before, typical. But today I am in pain. My right arm is not bad but my left arm i struggle to lift stright over my head, right where the outer deltoids meet my armpit. and it hurts

Is this something that i should be concerned about or is it nothing more then soreness from being over worked?

http://www.discussbodybuilding.com/m_214540/mpage_1/key_/tm.htm#214546

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RICE is for now.. (Rest, Ice, Compression, Elevation)
 
Its probably not serious..BUT if the pain is there for more than a week, see your doc.
 
But for now, just ice it, and take it easy.