I had something similar a couple of months ago, but soon cleared up throughout the day. I thought it was an allergic reaction at first, but now that it's happened again I am worried it might be something more serious. I'm experiencing some bloating and a light amount of stomach discomfort.
A rash would look more like red, raised spots. It looks like thread veins which sometimes can go away or be permanent. You can get them on your abdomen or legs. You could try a food diary to see if a food is causing bloating, stomach discomfort and these marks. If this doesn’t help, see your doctor.
Thank you for your response! I will start logging what I eat and hopefully see if it correlates with the marks I've been having.
If the bloating and stomach discomfort is resolved by finding a food trigger, but the marks remain, they could simply be thread veins. Your doctor will be able to verify this. I have lots of thread veins of all different shapes on my legs. Thread veins are harmless but unsightly.