A member asked:

Why did my mosquito bite turn into a hard lump under the skin on the top of my leg?

A doctor has provided 1 answer
Dr. Louise Andrew answered

Specializes in Emergency Medicine

Not sure: An extreme allergic response could cause a large welt, and it could last a couple of days. If this is very old, though, it is possible it wasn't a mosquito but some other insect and it left a stinger inside you. If painful, it could be infected. You might want to have it examined to see if there is pus that needs to be released. Meanwhile, apply warm compresses for 15 mins 4x daily.

Answered 7/25/2018

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Hard sometimes painful lumps under the skin on legs and torso?

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