A member asked:

Why does it take a week for sand flea bites to show up?

A doctor has provided 1 answer

Delayed reaction: Some people have delayed hypersensitivity reactions to the bite. Most of us are familiar with an immediate reaction - for instance a mosquito bites you and you immediately get a red, itchy bump. A similar reaction can be through a different pathway in your body, that can take days to activate and develop a reaction - it's called delayed hypersensitivity reaction, and likely what you are noting.

Answered 3/31/2019

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