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www.reference.com/article/possible-medical-causes-lump-under-arm-ad04504e67a3716a

Allergies, vaccination reactions, and bacterial, fungal or viral infections can all cause lumps underneath the arm, according to Healthline. Sometimes harmless growths composed of fatty tissue, called lipomas, or benign fibrous tissue growths, called fibroadenomas, cause lumps in the armpit. However

www.reference.com/science/possible-causes-lump-arm-muscle-7486a574061eae19

An arm lump can be caused by one of a variety of conditions, including inflammation, infection, trauma or tumor growth, according to Healthgrades. Lumps can be described as nodules, bumps, tumors, cysts or contusions and may be firm, painful, soft or painless.

www.reference.com/article/causes-painful-lumps-under-skin-297f3c303d4740a

Painful lumps under the skin are usually caused by injuries or infections, states MedlinePlus. These lumps include boils, which are caused by infected hair follicles, and carbuncles, which are groups of boils, according to WebMD. Lipomas are soft lumps under the skin that have no known cause, states

www.reference.com/article/cause-fat-lumps-under-skin-9a00b5db91c8cce3

The cause of lipoma, a condition in which the skin has fatty deposits below it, is not clear, but it may involve genetic factors, notes WebMD. A mild injury also sometimes causes growth of the fatty deposits. Lipomas are harmless and do not progress into cancer.

www.reference.com/article/causes-numerous-lumps-under-skin-9f08be7e4c2c094f

Lumps under the skin can have a variety of causes, including lipomas, enlarged lymph glands, boils, neurofibromas, dermatofibromas and some cancers such as keratoacanthoma, according to WebMD and Patient.info. For example, lipomas are tumors made of soft tissue that occur singly or in small groups,

www.reference.com/article/causes-lumps-bumps-under-skin-efcd13770c1f0987

Several conditions can cause lumps and bumps to form below the skin or on its surface, such as cherry angiomas, skin cysts, epidermoid cysts, keratosis pilaris and folliculitis, according to WebMD. Skin bumps can also result from infections, allergic reactions, hereditary diseases or acne, reports H

www.reference.com/world-view/could-cause-hard-lump-arm-just-below-elbow-6ad75687ea683a81

A cyst or a lipoma can cause a hard lump just below the elbow. Cysts are characterized as soft or hard, painless or painful, according to eMedicineHealth.

www.reference.com/article/causes-upper-arm-pain-377916424d6eddc2

Possible causes of arm pain, which may affect the upper limb and start anywhere from the fingers to the shoulder, include an injury, overuse of the limb or referred pain from another body part, according to Healthline. Arm pain may also indicate carpal tunnel syndrome, arthritis, fractures, heart di

www.reference.com/article/muscles-upper-arm-3b54fd555ee10bd0

The muscles of the upper arm that are visible from the outside are the biceps brachii, the triceps brachii, the brachioradialis and the extensor carpi radialus longus. The coracobrachialis and brachialis are deeper upper arm muscles. The deltoid muscle is a shoulder muscle that increases the arm's r

www.reference.com/article/muscles-make-up-upper-arm-dff4d914429db5dd

The main muscles of the upper arm include the biceps, brachialis, coracobrachilis, and the triceps. All but the triceps are located in the anterior, or front, compartment of the arm; the triceps is in the posterior compartment. The other muscle that exists in the upper arm is the deltoid. The muscle