Itchy lumps on chest

For a few years I have had these lumps on my chest. They are painless, but some days they itch like crazy. They feel firm inside, but seem to have a thin, slightly soft layer over them. They never seem to shrink or grow, but obviously they have grown very slowly because what started as three lumps near each other at the beginning has become a single long lump about 1/4 inch wide and 2 inches long. All told I have 5 lumps (two being series of lumps themselves, one used to be three and one used to be two - it started as 8 distinct lumps at roughly the same time) about 1/4 inch in diameter/thickness in a 3x3 inch space in the middle of my chest between the sternum and clavicle. I can't seem to find any articles online quite matching my symptoms. My best guess is some type of cyst, but I've never heard of so many and haven't found any pictures. BTW, I am a 32 y/o man. Anyone have any thoughts/similar issues?