I have a strange bump on my neck..

So I noticed a strange bump on my neck. I'm pretty sure it's some sort of pimple but I've been outside often so I'm also thinking it's a bug bite. I'm not sure and I'm starting to get a little worried. I noticed it a few days ago and it was quite small but then it started getting larger and larger. I just really want to know if I should be concerned and how to get rid of it. I know these pictures aren't clear, but any information would be great. Also I've noticing more bumps to be forming around the area.