I am a male 40 yrs old in shape. 4 months ago i noticed a small hard bb size lump under arm pit area, horizontal to nipple. From what i can see it is a node area... This thing is small enough that i kind of have to feel around for it and press into some fatty area and push against my ribbs to flip back and forth over it.. Small enough when i stroke upwards you can't feel it,, but rubbing downward you can feel it.
It's been there for 4 months,, seems slightly smaller latley... It's of no discomfort and just always wondered if it wasjust a chest muscle small fiber knot..

Do i need to be concerend,, or just continue monotering somthing that is that small ?? I been on a health kick latley to loose 10 lbs.. and since then i thought with less fat in that area i'd feel it more,, but it seems to be harder to find latley.