Hello,
You used a deodorant after which you are experiencing stinging pain in the armpit. It can be due to
allergic reaction on use of the deodorant. Stop using it. Medical conditions that may cause swelling or pain in the armpits are cysts, infection, irritation due to shaving or antiperspirant use. You can take anti inflammatory medicines like
Combiflam, one SOS when required for relieve.
Cold compress will help to reduce muscle soreness. To reduce
lymph node swelling you can apply warm compress. However, such symptoms may be indicative of serious diseases like
lipoma, skin cyst, cancer, axillary lymph-adenopathy, etc. You are suggested to clinically get examined & get all required investigations done to detect the pathology causing you discomfort. You will be treated accordingly with medicine / surgery.
Take care. Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. Nupur K., General & Family Physician