There are more reasons for hard bumps on the body, generally considered to be the symptoms of keloids, folliculitis, dermatofibroma or nodular itchy rash. 1. Keloid is a manifestation of abnormal proliferation of connective tissue in the skin, and most of the patients themselves have keloid physique. The manifestation is and the skin appears and the shape of the wound consistent with the stripes and lumps, the surface is smooth, the texture is rubbery. 2. Folliculitis is caused by bacterial infection, usually a small break in the skin is invaded by pathogenic bacteria. Manifested as a hard red bumps on the skin, the surface of the bumps can have a yellowish-white pus head, pain is obvious. 3. Dermatofibroma mostly occurs after infectious inflammation of the skin or insect bites, and is benign fibrotic tissue. It is a benign fibrotic tissue, which is manifested as a red or dark red hard lump on the skin, and the lumps may remain unchanged for several years without any obvious discomfort. 4. Nodular itchy rash is a special type of eczema, which is related to immune disorders and allergies, and is often accompanied by intense itching. The appearance of hard bumps on the body is recommended to consult a doctor in a timely manner, in accordance with the doctor’s instructions to deal with.