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An armpit lump is a swelling or bump under the arm. A lump in the armpit can have many causes. These include swollen lymph nodes, infections, or cysts.
Lump in the armpit; Localized lymphadenopathy - armpit; Axillary lymphadenopathy; Axillary lymph enlargement; Lymph nodes enlargement - axillary; Axillary abscess
Lumps in the armpit may have many causes.
Lymph nodes act as filters that can catch germs or cancerous tumor cells. When they do, lymph nodes increase in size and are easily felt. Reasons lymph nodes in the armpit area may be enlarged are:
Cysts or abscesses under the skin may also produce large, painful lumps in the armpit. These may be caused by shaving or use of antiperspirants (not deodorants). This is most often seen in teens just beginning to shave.
Other causes of armpit lumps may include:
Home care depends on the reason for the lump. Check with your health care provider to determine the cause.
An armpit lump in a woman may be sign of breast cancer, and it should be checked by a health care provider right away.
Call your health care provider if you have an unexplained armpit lump. Do not try to diagnose lumps by yourself.
Your health care provider will examine you and gently press on the nodes. You will be asked questions about your medical history and symptom, such as:
You may need more tests, depending on the results of your physical exam.
Armitage JO. Approach to the patient with lymphadenopathy and splenomegaly. In: Goldman L, Ausiello D, eds. Cecil Medicine. 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 171.
Tower RL II, Camitta BM. Lymphadenopathy. In: Kliegman RM, Stanton BF, St. Geme JW III, Schor NF, Behrman RE, eds. Nelson Textbook of Pediatrics. 19th ed. Philadelphia, Pa: Elsevier Saunders; 2011:chap 484.