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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Causes Black Lines Behind The Knees?

My girlfriend is freaking out, and she says she has a black line behind her knees on the crease, it s not a vein she claims that it s a horizontal, black line covering the crease behind her knees and both of us are freaking out over the phone and just please help us. Please. What could this be and what should we do?
Fri, 1 Dec 2017
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Dermatologist,  's  Response
Hi.
As per your case history your girlfriend is having insect bite dermatitis.
My treatment advice is -
1. Don't scratch the lesion as it may worsen the condition.
2. Apply a mild antibiotic plus steroid cream like fusiderm-b cream twice daily on it.
3. Take an antihistamine medication like levocetrizine twice daily for 7-10 days.
4. Other treatment options are oral antibiotics, oral steroid taken only after consulting a dermatologist.

Thanks.
Dr. Harshit bhachech.
MBBS, DDVL.
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What Causes Black Lines Behind The Knees?

Hi. As per your case history your girlfriend is having insect bite dermatitis. My treatment advice is - 1. Don t scratch the lesion as it may worsen the condition. 2. Apply a mild antibiotic plus steroid cream like fusiderm-b cream twice daily on it. 3. Take an antihistamine medication like levocetrizine twice daily for 7-10 days. 4. Other treatment options are oral antibiotics, oral steroid taken only after consulting a dermatologist. Thanks. Dr. Harshit bhachech. MBBS, DDVL.