Couple yrs now i would get like swelling on my vagina it feels like a bump but it's like a lymp node doesn't hurt when i would compress it with hot water it will go in days i sweat a lot can it be .

Duct blocked: It sounds like it could be intermittent blockage of a duct to one of the glands in that area. That would explain it can come and go and decompresses with a warm compress. Point this out to your PCP or GYN next visit and get their advice after a good history and they can examine the area. Be well.

Bartholin gland cyst: Could be an infection or Bartholin's gland cyst. next time it happens show it to your GYN or your doctor.