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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Causes Sore Red Lump On The Back Of The Thigh?

I've woken up with a red lump on the back of my thigh, it has a dark centre (almost looking as if blood is trapped under the skin) and is sore to touch...I was wondering if anyone could tell me what this could be and whether I need to go to the doctors or if it will disappear on its own.
Fri, 1 Aug 2014
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Pain Medicine & Palliative Care Specialist,  's  Response
Hi,
This could have been caused by an insect bite. As you describe it as painful and red, I think it may be infected and there is a risk you may develop cellulitis. Therefore, I suggest you go to the ED for assessment and possible antibiotics.
Regards,
Dr K A Pottinger
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What Causes Sore Red Lump On The Back Of The Thigh?

Hi, This could have been caused by an insect bite. As you describe it as painful and red, I think it may be infected and there is a risk you may develop cellulitis. Therefore, I suggest you go to the ED for assessment and possible antibiotics. Regards, Dr K A Pottinger