I have lumps under the skin around my groin but not on it?

I am a male. They don't hurt at all but I can still feel them under the skin with my hand. They are mostly long and slender. They feel like long hard vains when I touch them with my hand. I don't know what they are and I am worried they are tumors or something. I have had them for a very long time but just now recognized it may be something hazardous to my health. Please help me. Thank you.