A member asked:

What bug leaves a red mark that blisters and runs pus?

4 doctors weighed in across 2 answers

Several can: If there is puss then there is an infection and you need to see a doctor.

Answered 7/4/2014

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Dr. Heidi Fowler answered

Specializes in Psychiatry

Afraid that many: different types of insect can cause this type of reaction. If the area becomes red, swollen, warm, with increased pain & red streaking please get seen. I am assuming that what is described as pus may be reactive material from the bite. Take care.

Answered 7/5/2014

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