The armpit area connects the muscle of chest, arm and rib cage. Muscle strain in pectoralis major or muscle overuse through physical activity can cause: pain in armpit, limited range of motion, weakness, swelling and tenderness. Enlarged lymph node due to infections, lymphoma or leukemia, itchy, scaly plaques of inverse psoriasis, diabetic neuropathy, hair follicle inflammation are other causes.
Answered 3/20/2023
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