Skin coloured patches appearing on my body?

In the last month I have noticed 4/5 of these patches/lesions appearing on my body - 2 on my left arm, one on my back, one at the top of my stomach and a new one I noticed yesterday just above my left armpit. I first noticed the first one about a month ago and it hasn't gotten any worse (actually seems to be getting better but that may just be me imagining things). Anyways, any ideas what this could be? They're not itchy or painful. 

I'm no doctor but could be from stress or maybe eczema. My son's skin does the same. Some type of hives. Show it to a doctor so they can tell you what to put on them. The wrong cream or ointment can make it worse.

Thank you for your reply! I've been to the doctors several times in the last 2 months (for stomach and back pain which they've kinda just dismissed me so I've been putting off going again) but you may be on to something with the stress. I'll give it a couple more weeks, see if more appear or if anything changes .