I have a fear of lyme disease that is massively disproportionate to the risk of anyone in my family getting it. Have just noticed a small dot on ds arm with a ring around it. Photo attached. It is not a fading bruise and I haven't previously noticed it being bigger or redder. He is 2, so I do see his arms closely every day. Does this look like a tick bite? The pics on google were all much redder than this.