Hello!

I am just wondering if anyone can help or give me a peace of mind. I've been to the doctors 3/4 times now because both armpits were irritated. Obviously they sent me away saying nothing was there and that I'm young,fit and healthy. I left it but still very conscious of it and I couldn't stop checking everywhere on my body for any other changes. I went back again o Monday and saw a nurse who said she was struggling to find anything and told me to buy some ibrophen gel which I did. Yesterday I was checking and could feel a little moveable lump that disappeared under the skin on my axillary tendon? I've been having pins and needles, neck and back ache so I'm not sure if I have a lipoma pushing on a nerve or what I've strained a muscle but surely a strained muscle doesn't cause lumps? 
 

if anyone can help on this I'd really appreciate it

thank you xx