Rashes behind knee

I m having rashes behind my knee since 2 days and even have difficulty when I strech or bend my knee. The skin there has turned black and red. What may be the reason for this.? What should I do.? It was red 2 days before as in the picture and now it is red and black.
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Doctor Answers (1) on Rashes behind knee

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Dr. Pinanky Jadhav-Adhe Pune | Dermatologist
Hello, from the photograph it appears to be allergic/ toxic reaction due to insect crawling called as paederus dermatitis. Avoid touching this area. Consult a skin specialist for treatment. Avoid self medication. Hope this helps you. Warm regards, Dr Pinanky Jadhav, Eternis Skin & Hair Clinic, Pune
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