Hi,
Yes i have the same problem im not sure what it is but if i had to guess i thought it might be from not enough lubrication because rubbing something wen its dry makes it swallon so my guess would be that, anyone else know what it is coz i really have no idea?

Yeah-

well, when you're really aroused, your whole genital area will get swollen. That's normal.

If you have rough sex or there is a lot of friction (not enough lube) it could get swollen for longer and possibly painful. In this case, you need to use more lube (buy some) to prevent that.

its normal