Help please

So me and my family went to the beach today and afterwards I showered and when patting myself dry down there I felt pain, I started to check it out to see if I could see the problem and there’s this hard lump like a ball underneath my skin in between the labias , and I keep reading that it’s most likely a cyst but what do y’all think ?? It hurts the touch , I know it’s not an std or anything like that buttt still anxious on what it is🙃