Getting a bit worried as DS (2) has 2 fluid filled area on his foot after a bite..

[whereisthesun]

DS woke up on Thursday morning with what looked like two mosquito bites on his foot so I just thought they would go away. By Friday morning they were fluid filled hard areas and looked nasty, they both popped and one has gone a bit crusty while the other has filled up with fluid again. Do you think this could be just a reaction to Mozzy bites or is it something else? I have just noticed there is another small one appearing on the other side of his foot. It's making me a bit worried.

[MaryMotherOfCheeses]

Doesn't sound like a problem tbh, so long as the area around it isn't red and hot.