I have hard bumps, and it shown up with itchy, and look like a keloid, but it's brown, hard, round, and itch in my sholuder, arm, back :( what is it?

Dermatofibtoma: If there were no incisions or punctures at the locations of these bumps, they are likely to be dermatofibromas. These lesions are benign but have many scar-like qualities.

May be keloid: Keloids are scars which may arise spontaneously or the result of trauma including surgical incisions. They must be differentiated from other types of scars such as hypertrophic which are common in the early phase of healing. Treatment if necessary includes many choices including compression, topical medications, silicone sheeting and corticosteroid injections. Surgical treatment is an option.