probably nothing, but definitely go see a doctor and get it checked out.
red spots could be anything. my daughter broke out into red spots (look like bites but not itchy at all) all over her torso and spreading down her legs (to the knees) and we have no idea what caused them! we have finally narrowed it down to a possible allergic reaction to her brand new bathing suit... which i forgot to wash before she wore it ... we're thinking maybe the chlorine in the pool, mixed with the dye in the suit?? or possibly the laundry detergent at her grandma's house... spots started there. anyway, it could be a simple thing like that.
however... it could also be something more serious. my aunt has inflam. breast cancer, and her's started with red spots. doesn't sound anything like what you're describing, but it's worth getting checked out to be sure!