Hi, may I answer your health queries right now ? Please type your query here... My three year old son has had a rash under both arm pits for two weeks now. He seem to be in good health, running laughing and playing with his 2 year old brother he is eating well. This rash looks like many little red pimple like bumps that have gathered into several blotches. It seems to subside under one under arm for a couple of days(looks like it almost gone) then it gets worse, switching back and forth from underarms right now it s bad under both. He is not scratching at all, he says it doesn t hurt at all. Can you please help?