The 22-year-old British tennis star said her hand and ankle swelled up but she refused the treatment in case contamination led to a positive doping test.
Raducanu told reporters at a pre-tournament news conference on Friday: “All of us are probably quite sensitive to what we take on board, what we use.
“Yesterday, for example, I got really badly bitten by I don’t know what, like ants, mosquitoes, something. I’m allergic, I guess.
“They flared up and swelled up really a lot.”
She added: “Someone was, like, giving me this antiseptic spray, natural, to try to ease the bites.