Hello. I am a 27 year old who is 5 8 and weighs 140 pounds. For about 2 or 3 weeks, every time I laid down, I would smell something that smelled like vomit. I realized this smell was coming from my armpit. Recently I noticed both of my armpits have gotten a somewhat sweet smell. However, in my left armpit there has developed a dark (somewhat firm) mark. It was a lump at first but I squeezed it and a thick dark-brown substance came out; which smelled foul. The lump is gone but in addition to that sweet smell, the dark mark on my armpit still smells like vomit. I went to the doctor, but she was no help.