Our expert says:
There are a number of causes for 'sores' premenstrually. These include infected hair follicles or sweat glands and thrush. Herpes does not typcilaly occur only at the time of a period. The only way to know what the cause is in your case is for a doctor to examine you at the time that you have the bumps.
The information provided does not constitute a diagnosis of your condition. You should consult a medical practitioner or other appropriate health care professional for a physical exmanication, diagnosis and formal
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