Based on the information provided, it is possible that the bump near your groin on the left side is a sebaceous cyst. This can be caused by a buildup of sebum and may become larger and more painful during physical activity. It is generally a benign issue that does not necessarily require treatment. However, if it interferes with your daily activities, it can be removed by a doctor. It is important not to try to squeeze or pop it yourself to prevent infection and recurrence. If there is redness, warmth, swelling, or an increase in pain, there may be an infection, and you could apply an over-the-counter antibiotic ointment. It is advised to seek further evaluation from a healthcare professional, such as a pharmacist, who can provide more personalized advice.