What could this be?

Sherita • Smileyy Is My Name Very Goofy & Love Making Friends Looking For Bestfriends Though😂💕😘
I have a situation here. My friend has like a pus like bump in the crease of her thigh and pelvic bone kinda near her vagina.. she wasn't sexually active with penetration until Last yr in September.. before her first time, she had this bump, and she is freaking out about it... could it be any kinda of std,sti, etc??