Years and years ago I had the same problem. For me hot baths didn't help. I had to use a hot wet washcloth, I'd fold it to make it slender and apply it to the area.
Be careful, please don't burn your skin. Tinker with the water temperature until you find the ideal of very warm but not too hot water & cloth. Apply the moist heat 3-5 times a day. Thankfully for me It did help and the lump slowly went away.
Contact the local Planned Parenthood office, they typically treat women's health problems for free or for a donation.
Wear looser fitting slacks, jeans, shorts and dresses and skirts without pantyhose Wear cotton crotch under pants that aren't too snug. In our area the Volunteers of America Store is the least expensive place to buy used (yet clean) clothes and underwear.
If you frequently wear mini-pads this could be part of the cause of the cyst. Wear only unscented pads. Also and try a pad with a different weave. For example, Kotex has an almost cardboard type mini pad (that works great for me.) My previous brand of pads were similar to fabric and tended to "cling" a little to close for my comfort.
I'm wishing you rapid relief.
A.