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Hi there,This is Dr Basu, experienced Internal Medicine Specialist.I am here to address your concerns and provide great service.
The hard lump can be due to the infected cyst arising from the underlying skin layer.
Sebaceous cyst with fibrosis can feel firm.
This should improve with warm compress.
But sometimes may need surgical removal if becomes more painful.
Antibiotic course also may be considered.
Yes you should get it checked by your doctor in case worsening.Best wishes,It was my pleasure to help you today.If I have answered all your questions, Please rate my response Excellent (click on the 5th star).Please bookmark my profile for fast, reliable and authentic answers!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/