what's on my boyfriends back??

Ta
So he comes home and he's complaining about something hurting on his back. So I check it out and I see this. It's not a zit, it's just bleeding out of his pores kinda he says it hurts like one but not really. I'm not sure what this is. But if anyone has any answers or ideas anything would be nice. 
UPDATE** he says he didn't feel any stinging or pain until he took his shirt off. I thought it could be a boil forming or a spider bite but he didn't feel anything and it only hurts to the touch. But thank you all for answers💘

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