Lump in armpit from deodorant?

I woke up this morning and felt a lump under my skin. It was moveable and not really painful (only the inherent pain of squeezing your skin) but neveless it was new so it concerned me. When I took a picture of it I realized it was white on top and it was a deodorant clump. Normal enough except this actually went into the skin, like pus of a pimple. I had squeezed out maybe three good sized clumps of deodorant. Has this ever happened to you before? I shower before bed most nights so I’m not sure how this much buildup could happen, or how it could sink below the skin. 

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