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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Causes Lump On Armpit Of An Infant?

Dear Doctor, I found a lump under my 5 months baby left armpit about 2 months ago. I also notice a significant appetite decrease at about the same time. Her birth weight is 3.2 kg, on exclusive breastfeeding and gained weight pretty well until last month. She has been 6.9 kg since last month, didn t gain an ounce. I have heard that BCG vaccine might have caused this. Is that mean my baby is infected by TBC?
Tue, 29 Dec 2015
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Pediatrician, Infectious Diseases,  's  Response
Hello, I appreciate your concern.
What your baby has is called a BCG lymphadenitis (swelling of the lymph node in her armpit). Her weight gain so far has been good and if there is no weight loss or fever or pus from the swelling, there is no need to investigate. It should resolve in the next few weeks.
When you should take her to a doctor:
1. High fever
2. Prolonged cough
3. Pus from the swelling
4. Increase in size of the swelling
It does not mean your child has TB (M. tuberculosis).
M. bovis is a type of mycobacterium that is used for the BCG vaccine, and is nothing to worry about.
Hope this helps you!
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What Causes Lump On Armpit Of An Infant?

Hello, I appreciate your concern. What your baby has is called a BCG lymphadenitis (swelling of the lymph node in her armpit). Her weight gain so far has been good and if there is no weight loss or fever or pus from the swelling, there is no need to investigate. It should resolve in the next few weeks. When you should take her to a doctor: 1. High fever 2. Prolonged cough 3. Pus from the swelling 4. Increase in size of the swelling It does not mean your child has TB (M. tuberculosis). M. bovis is a type of mycobacterium that is used for the BCG vaccine, and is nothing to worry about. Hope this helps you!