This is the time of the year when everything that bites is out in force. You don't have to be have been anywhere near bushes or grass - they will find you!
Cleg flies, Black Flies, Mossies, Horse Flies etc will all track you down and of course the constant damp conditions have increased them threefold. My husband, who has never been a target now has two bite sores on the backs of his legs, so just use Savlon or TCP on the bites you have to prevent infection and try to use some insect repellent when you venture outside.