Problems like this appearing abruptly and painful are usually of not a serious nature, it may be simple inflammation due to Hormonal imbalance or maybe due to some unnoticed injuries if it is unilateral. Some time there may be some infection, in infection we Also feel heat tenderness and slight to moderate Fever.
Next Steps
Take Phytolacca D Q One drop Thrice Daily in some water for 7 days.
Health Tips
Avoid wearing abnormally fitted clothing. For follow up, you can consult me in person online through Practo Consult.