Mosquito bites turned purple with red dots.?

I got some mosquito bites from working outside a week or two ago. They seemed like mosquito bites at least, they were swollen, itchy, white lumps and there are a lot of mosquitos around where I live. Well it got weird when they didn't go away after about a week and felt itchy for several days. They are now purplish red with the worst one have red dots speckling it. I have about 6 of them all on my legs. They don't itch anymore but it worries me that they haven't gone away and are starting to look obscure. I'd like to think it isn't anything too serious cause they have the same shape at least of the original mosquito(?) bite just turned red and purple.