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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Causes Pus Filled Black Spot On The Shin With Redness Around It?

My son has a black spot about the size of a quarter on his right shin surrounded by a patch of redness. He had a boil on his neck and we went to the emergency room Wed, July 7, and they prescribed him sulfameth/trimethoprim twice a day and clindamycin every eight hours. the boil on his neck has since busted and a green ball came out. It appears to be healing fine now. The one on his leg has a small pus ball on it but it is gone now. The black spot and redness remain. He stayed indoors over the weekend, but went back to work today. When came in from work he said that he feels sick to his stomach. He works in the heat all day. Could the heat be the reason he is not feeling well? Can I put neosporin on the spot on his leg?
Tue, 31 May 2016
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Infectious Diseases Specialist,  's  Response
Hi,
Welcome to HCM

Based on the details mentioned in your query, I am suspecting your son has had a bacterial infection of skin called furuncle. It heals once the pus is drained. Please continue the antibiotics prescribed and you can apply neosporin to the leg lesion.

An upset stomach could be caused as a side effect to antibiotics your son has been taking.

I suggest he take a fluid diet and drink adequate water per day.

The upset stomach will get better once he stops the antibiotics.

The skin lesions will also heal within 3 to 5 days.

I hope I have helped you with this answer.

thanks.
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What Causes Pus Filled Black Spot On The Shin With Redness Around It?

Hi, Welcome to HCM Based on the details mentioned in your query, I am suspecting your son has had a bacterial infection of skin called furuncle. It heals once the pus is drained. Please continue the antibiotics prescribed and you can apply neosporin to the leg lesion. An upset stomach could be caused as a side effect to antibiotics your son has been taking. I suggest he take a fluid diet and drink adequate water per day. The upset stomach will get better once he stops the antibiotics. The skin lesions will also heal within 3 to 5 days. I hope I have helped you with this answer. thanks.