Hello and thank you for your question. I’d be happy to assist you.
Is she taking any blood thinner or other medications?
Any other medical history?
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Sorry for late reply and inconvenience.
Well as you describe,possible causes may include Hematoma formation due to overdose of aspirin with out any injury,Cellulitis/Infection,Angioedema.
She should take OTC Motrin and Claritin.
Also continue cool compresses.
Apply Polysporin ointment on it.
If symptoms are getting worse over the time then visit Emergency room for prompt evaluation and management.
Otherwise see her regular doctor and have blood tests (coagulation studies) to make sure she is clotting properly.
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