Can anybody help me out please.



I get this recurring red bump every month or so.
no pain or itch. it looks and feels like a pimple but doesn't hurt at all.
normally shrinks after a day of noticing.
goes quicker if apply some tea tree oi or anti fungal cream. a tiny flake is left which takes a few days to disappear.
Always the same size. perfect little circle. no joining up of multiple ones. just singular.
I thought it was nodular scabies but it doesn't itch.
I am sexual active but with same partner for 2 years,
any clues? it doesn't last long enough to get a doctor to see it.
Thanks