As per your description of the complaint (Redness
, Itching, Bump, self limiting) it may be urticarial rash
, or allergic dermatitis
. Recurrence at the same place may be associated with exposure to some kind of allergen which may be cosmetic, or food etc. to findout this u will have to be alert in noticing the exteranl or internal thing that may have caused it. note down the names of such things you suspect and then give them trial one by one and thus you can confirm.
If you have some other complaint there like discharge, scaling etc. then let me know.
in diet you can avoid fish, bringel, pickels and rich food.
drink plenty of water, eat fresh fruits and green leafy veg.
It is advicible to consult a homoeopath if needed for the lasting cure.