What could be causing a large, painful lump under the arm of an infant?

Answer by  cio (64)

It may be lymphadenitis, inflammation of lymph nodes, usually due to infection. There are lymph nodes located under the arm pit, amongst other places, such as the throat.

Answer by  CJ81 (232)

This is likely a swollen lymph node. Everyone is prone to getting swollen lymph nodes when they are sick, even with minor colds as the lymphatic system is what fights the diseases an infections we contract. It would be best to monitor the lump. Most will go away on their own, otherwise seek a pediatrician's advice.

Answer by  Mel68 (11)

The lump could be caused by a clogged pore, an infected lymph node, an ingrown hair, or possibly a bug bite of some sort. I have had a clogged pore personally and know they are painful. An ingrown hair or bug bite can be seen by doctor to rule out the infected lymph node possibility.

Answer by  jennie (77)

This could very well be a cyst. You should try to take him to your pediatrician as soon as possible. I would also get a second opinion. My daughter had a cyst under her arm and it took five doctors to actually diagnose it as a cyst.It was very scary for me.

Answer by  Caryn85 (418)

A lump under the arm could be an infection boil. It is easily treated at home and is very common. A good method to use is getting a hot rag and messaging it on the boil and then removing it and messaging it with just the tips of your fingers. You should alsouse cut some kind of cut cream.

Answer by  Aubs (1089)

If it is under the armpit, it is more than likely a swollen/enlarged gland. This can be caused by a variety of things; infection, allergies, etc. They are usually not serious, but it is worth it to get them checked out.

Answer by  JuliaJolie (415)

A large, painful lump under the arm of a baby can be a swollen lymph gland, or a benign cyst. It can also be the start of a tumor.

Answer by  dolzc (27)

These are called lymph nodes that usually appears when they have lymphatic system disorders. Once it is treated the nodes are supposed to be gone too.