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Most armpit lumps are down to infection or a harmless lump, not cancer. This guide explains what usually causes a swollen armpit lymph node, the specific red flags to act on, and when an axillary lump could mean lymphoma.
Finding a lump in the armpit is unsettling, so let's start with the most important fact: the vast majority of armpit lumps are not cancer. The armpit (the axilla) is packed with lymph nodes, sweat glands and fatty tissue, and any of these can produce a lump. Most often it is a reactive lymph node — a node that has swollen while your immune system deals with an infection somewhere nearby, such as a cut on the hand, an insect bite, a skin infection, or a recent viral illness.
Other everyday causes include a blocked or inflamed sweat gland or boil, a harmless cyst or a lipoma (a soft, fatty lump), and irritation from shaving or an ingrown hair. In Telangana and Andhra Pradesh, tuberculosis (TB) is also a genuinely common cause of swollen lymph nodes and should always be considered. Against this backdrop, lymphoma is an uncommon cause of an armpit lump — but it is the one nobody wants to miss, which is why a lump that does not behave like a simple infection deserves a proper look. For the bigger picture, see our Lymphoma hub and our guide to when a swollen lymph node could mean lymphoma.
In everyday practice, the great majority of enlarged lymph nodes are benign and reactive — the result of infection, not cancer. General-practice studies have found that only a small percentage of patients presenting with a swollen lymph node turn out to have a malignant cause, and unexplained lymphadenopathy in primary care carries a low overall risk of cancer. This is exactly why guidelines advise watching a node for a few weeks when there are no red flags — and investigating promptly when there are. (Source: peer-reviewed primary-care lymphadenopathy studies, consistent with NCCN and ESMO guidance.)
These benign and infective causes account for most armpit lumps. Lymphoma sits further down the list — important, but not the likely answer.
The commonest cause. A node swells as it fights an infection nearby — a hand or arm wound, a skin infection, or a viral illness. It is usually tender, appears quickly, and settles within a few weeks once the infection clears.
In Telangana and Andhra Pradesh, TB is a genuinely common cause of swollen nodes. TB nodes can persist, feel matted together, and sometimes discharge. Because TB and lymphoma can look alike, a persistent node may need a biopsy — see TB or lymphoma?
A soft, harmless lipoma (fatty lump), a skin cyst, or a blocked/inflamed sweat gland or boil can all produce an armpit lump. These are benign, though an infected sweat gland can be painful and recurrent.
Ingrown hairs, folliculitis and shaving irritation can cause small, tender bumps in the armpit. These typically improve on their own or with simple skin care and are not a sign of anything serious.
Because breast tissue extends towards the armpit, some armpit lumps relate to the breast. Any new armpit or breast lump in a woman should be assessed clinically and, where appropriate, referred for breast imaging — a straightforward part of the work-up.
Uncommon, but important. A painless, firm, slowly enlarging axillary node that does not settle can be lymphoma — especially with nodes at other sites or B symptoms. This is the pattern the red-flag rule below is designed to catch.
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If a lump has lasted beyond 3–4 weeks, is painless and firm, or comes with fever, night sweats or weight loss, don't keep waiting on antibiotics. CION's haematology team will find out what it is.
Most armpit lumps settle on their own. The job is to separate those from the small number that need investigation. Following the pattern used by NCCN and ESMO for unexplained lymphadenopathy, arrange a specialist review — and, if indicated, a biopsy rather than another course of antibiotics — if a lump shows any of these features:
The single most useful rule is the 3–4 week timeline: a node that has not settled by then, or that is painless and growing, should be examined rather than watched indefinitely. Still unsure whether your lump fits the worrying picture? Our guides to separating infection from red flags and how long is too long for a swollen node walk through it step by step — or book a specialist review.
Working out the cause of a persistent armpit lump follows a clear, step-by-step pathway. CION delivers the examination, ultrasound, biopsy coordination and pathology directly, and reviews every result at a multidisciplinary tumour board.
The doctor asks about how long the lump has been there, whether it is painful, recent infections or injuries to the arm and hand, TB contact or travel, and any B symptoms. They then feel the lump and check the neck, groin and other node areas — because whether nodes are enlarged at one site or several is an important clue.
An ultrasound is usually the first test. It shows the node's size, shape and internal structure and helps tell a reactive node from one that looks suspicious. It is quick, painless and involves no radiation, and it guides the decision on whether a biopsy is needed.
If a node is suspicious or has not settled, a tissue biopsy is the definitive step. For suspected lymphoma, a core-needle or excision biopsy is preferred over a simple fine-needle sample, because diagnosing lymphoma needs enough tissue to study how the node is built. The tissue also allows molecular and marker testing (for example CD20 or CD30 status) where lymphoma is confirmed. If TB is suspected, specific TB tests are added on the same sample.
If a biopsy confirms lymphoma, the news is more hopeful than many people fear. Lymphoma is one of the more treatable cancers, and outcomes have improved steadily. Published series report that Hodgkin lymphoma has an overall survival of roughly 80–90%, and the commonest aggressive non-Hodgkin type, diffuse large B-cell lymphoma, has a survival in the region of 60–70%, depending on stage and risk factors. These figures vary considerably by individual — by subtype, stage, age and response to treatment — and are drawn from published cancer-registry and trial data referenced in NCCN and ESMO guidance.
At CION, treatment is planned by a haematology-oncology tumour board and delivered directly: chemotherapy, antibody (immunotherapy) treatment, targeted therapy, radiation (IMRT), and watch-and-wait monitoring for slow-growing types are all provided in-house, while stem-cell transplant and CAR-T therapy are coordinated through accredited partner facilities when needed. We deliberately avoid naming specific drugs or regimens on this page — those are set individually and explained on our Lymphoma Treatment in Hyderabad page. You can also meet the team on our best lymphoma doctors in Hyderabad and best lymphoma hospital in Hyderabad pages.
For a suspected lymphoma node, guidelines recommend a core-needle or excision biopsy rather than a fine-needle aspiration. The reason is architectural: diagnosing and sub-typing lymphoma depends on seeing how the whole lymph node is organised, not just a scattering of individual cells. A fine-needle sample can miss the diagnosis or under-classify it, which is why NCCN and ESMO favour a tissue biopsy that preserves the node structure — so the right treatment can be chosen the first time. (Source: NCCN and ESMO lymphoma diagnostic guidance.)
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Start Your Story. Book Free Consultation.Most armpit (axillary) lumps are not cancer. By far the commonest cause is a reactive lymph node — a node that has temporarily swollen while fighting an infection nearby, such as a hand or arm cut, a skin infection, or a viral illness. Other common causes include a blocked sweat gland or boil, a harmless cyst or lipoma (a soft fatty lump), and an ingrown hair or shaving irritation. In Telangana and Andhra Pradesh, tuberculosis (TB) is also a genuinely common reason for a swollen node. A swollen lymph node from lymphoma is much less common than these everyday causes — but it is the "don't-miss" one, which is why a lump that does not settle deserves a proper look.
A short-lived, tender lump that appears with an infection and settles within 3–4 weeks is usually a reactive node and not a concern. See a doctor promptly if a swollen armpit lymph node is painless and firm, keeps growing, or persists beyond 3–4 weeks without an obvious infection. Other red flags are lumps at several sites at once (for example armpit plus neck or groin), a lump above the collarbone, or lumps with "B symptoms" — unexplained fever, drenching night sweats or unexplained weight loss. In those situations the right next step is a specialist review and, if needed, a biopsy — not another course of antibiotics.
Yes, but it is uncommon compared with infection and other benign causes. An axillary lump from lymphoma is typically a painless, rubbery, slowly enlarging lymph node that does not go away. Lymphoma more often shows up in the neck, but the armpit and groin are also common sites, and disease at more than one site is a recognised pattern. The only way to know for certain is to examine the tissue: an ultrasound guides the assessment, and a core-needle or excision biopsy gives the definitive answer. If your lump fits the red-flag picture above, do not wait — read "Do I have lymphoma?" and book a specialist review.
You often cannot tell for certain by feel alone, which is why persistent lumps are checked. That said, some patterns help. A reactive/infected node tends to be tender, appears quickly with an obvious infection, may feel warm or soft, and shrinks within a few weeks. A lymphoma node is more often painless, firm or rubbery, mobile early on, and slowly gets bigger over weeks rather than settling. TB nodes can be matted together and sometimes discharge. Because these features overlap, our guidance follows the "hard, soft or movable" question in more detail on our lymphoma lump texture page — but the safest rule is simple: a node that lasts beyond 3–4 weeks should be examined.
Assessment usually starts with a clinical examination and your history — recent infections, injuries, travel, TB contact, and any B symptoms. An ultrasound of the armpit shows the size, shape and internal structure of the node and helps decide the next step. Blood tests may be done to look for infection or other causes. If a node looks suspicious or has not settled, a tissue biopsy is the key test — a core-needle biopsy or a small excision biopsy, rather than a simple fine-needle sample, because lymphoma diagnosis needs enough tissue to study the node's architecture. If TB is suspected, specific TB tests are added. CION delivers ultrasound, biopsy coordination and pathology directly and reviews every result at a tumour board.
Pain is reassuring but not a guarantee. A tender, painful armpit lump that appears suddenly is more often an infected or reactive node, or an inflamed sweat gland or boil, and these usually settle. Painless lumps are statistically more worrying, and most lymphoma nodes are painless. However, a lymphoma node can occasionally ache, and an infection can be painless — so pain alone should never be the deciding factor. What matters more is whether the lump persists, grows, or comes with other red flags. If a lump — painful or not — lasts beyond 3–4 weeks, have it checked. See how long is too long for a swollen node for the timeline we use.
It could. In Telangana and Andhra Pradesh, tuberculosis is a common cause of swollen lymph nodes, including in the armpit, and TB nodes can persist for weeks, feel matted, and sometimes discharge. TB and lymphoma can look similar on a scan and can even be confused clinically, so a tissue biopsy is often what separates them. This is exactly why a persistent node should be biopsied rather than treated blindly with repeated antibiotics — both TB and lymphoma need the correct, specific treatment. Our TB or lymphoma? page explains how the two are told apart, and CION coordinates the right tests to reach a clear answer.
Browse our complete guide to lymphoma — symptoms, diagnosis, Hodgkin and non-Hodgkin subtypes, treatment, genetics, prognosis, survivorship and cost. Tap any topic to read more.