
What Does A Painful Lump Inside The Armpit Indicate?

As detailed below.
Detailed Answer:
Hi.
Noted your history well and understood the concerns.
Please give some additional information for me to assist you better:
- Age and gender?
- Please post the clear and focused photos as it helps for on-the-spot diagnosis in some cases.
- Is the eruption related to some food, additives, beverages, medicines or so?
- What is the size?
- Does it appear at the same spot?
- Does other part of the body develop similar lesions?
As per the history you have provided this certainly appears to be an allergic reaction.
Can be something like a fixed drug/allergen reaction - wherein the antigen -antibody complex gets fixed in the skin in a particular part of the body and gets instigated or enhanced on exposure to any instigating factor.
Another possibility can be Hidradenits.
Awaitin for your detailed feedback and photos.

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