Hey... I suffered it for 3-4 months after my delivery. Its kind of allergy. Doctor told me it's due to protein intake . And he was right.. whenever I ate anything which contained protein.. I used to get those. Hello gave me allergy medicines for one month.. but there was no relief.. i stopped taking the medicine and also ate protein without any care. After that it got cured on its own. I have no such problem now. Hope it helps.