Mumsnet hasn't checked the qualifications of anyone posting here. If you have medical concerns, please seek medical attention; if you think your problem could be acute, do so immediately. Even qualified doctors can't diagnose over the internet, so do bear that in mind when seeking or giving advice.
i got 4 mosquito bites 15 days ago in majorca, got no more in the rest of the holiday and they stopped itching and were barely visible. got home yesterday and they are itchy, red, and 1 has swelled up and is 5-6cm across, just since getting back to england? will antiseptic cream work?
Go to your GP with the big one if it is not a lot better in the morning. Infected bites get nasty quite quickly and you might need antibiotics. (speaking as someone who has recently had a week's worth for a bug bite of some description).