Such target lesions are characteristic of household insect bites
like that of ant, bugs or other blood sucking insects. If by wasp or bee will be strongly painful with local edema so ca not be missed.
The white center is the bite mark- the eschar, and the surrounding is the hypersensitivity
respnse and inflammation as a result of bite.
If size continues to increase then she may need Inj Tetanus
, antibiotics and pain killers.
Otherwise the problem resoves within 3 to4 day.
Do not apply alcohol or spirit or other creams, just keep it dry.