Hello. My boyfriend has just noticed a red, swollen bump on the front side of his shoulder this evening. It was not there earlier today. He says it is a hard bump and red around it.. it is not itchy or puss filled. It looks as if there may be some darker/black in the very center of it. I cleaned it and put some neosporin on it.He is 23 years old and has no medical insurance. Can you please help up figure out what this may be.