Pea size hard lump on the inside of my left arm?

Have it evaluated. The possibilities are virtually endless. The easiest thing to is have a doctor look at it.

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Pea size hard lump on the inside of my left arm on the outside of my arm and is sore to touch?

Cyst? Boil? A hard, tender lump that is new, usually means inflammation or infection (mild). Cysts and boils often occur under the skin, can be firm and tender. You could try hot compresses to the area. Some people even take an antibiotic to eliminate infection. To be sure, see your doctor who can tell you what you are dealing with. Read more...