 [ Symptoms ] how long after having sexual intercourse can i take a pregnancy test and get a valid answer [ Disease ] hi it does seem to be an allergic reaction sometimes it does take take time for the medicines to act especially when the inflammation factor is high you need to take steroid medicines orally along with the anti allergic tablets the creams that you apply locally should also have a steroid based content in it if still this does not resolve then consult a dermatologist thanks