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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Causes A Fluid Filled Bump Under The Skin On An Arm?

Hi, I have bump under my skin on my lift arm. At first i thought it was a pimple and i tried to pop it, some yellowish ozz came out but the knot just got bigger. Its red around the area and is very painful. What it be? I've had it for a couple of weeks but it never really brothered me till now
Fri, 16 May 2014
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Dermatologist,  's  Response
Hello and welcome to healthcaremagic

I would keep a possibility of Bacterial infection of hair follicle i.e furuncle OR a carbuncle.

If I was the treating doctor I would have advised an empirical oral antibiotic for a week OR 10 days (My choice of oral antibiotic would have been Amoxycillin 500mg in combination with clavulanic acid 125 mg, thrice daily, for a week OR Cephalexin 500ng thrice daily OR Cefadroxil 500mg twice daily, for a week).

That would take care of the infection.

An OTC antibacterial cream/ointment e.g 2% mupirocin can be applied twice daily.

An OTC pain killer e.g ibuprofen once or twice daily would help you deal with the pain.

regards
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What Causes A Fluid Filled Bump Under The Skin On An Arm?

Hello and welcome to healthcaremagic I would keep a possibility of Bacterial infection of hair follicle i.e furuncle OR a carbuncle. If I was the treating doctor I would have advised an empirical oral antibiotic for a week OR 10 days (My choice of oral antibiotic would have been Amoxycillin 500mg in combination with clavulanic acid 125 mg, thrice daily, for a week OR Cephalexin 500ng thrice daily OR Cefadroxil 500mg twice daily, for a week). That would take care of the infection. An OTC antibacterial cream/ointment e.g 2% mupirocin can be applied twice daily. An OTC pain killer e.g ibuprofen once or twice daily would help you deal with the pain. regards