Petroleum cures the itching and burning in frozen parts, but not as prominently as Agaricus leads all other remedies, especially when the condition affects parts where the tissues are thin over the bones, as over the back of the toes. The eruptions on the surface and the state of induration are like Graphites , but the oozing in Petroleum is thin and watery, and in Graphites it is gluey, honey like, sticky, viscid. You have indurations and cracks of the fingers, and rhagades in both remedies, but the horn-like warty growths, lifting up the quick of the nails, you will find only in Graphites . It is of wonderful use and competes with Rhus in eczema of the genitals of either male or female. Eruption on the scrotum, penis, vulva.
Petroleum produces small vesicles which itch, sting and burn.
Herpetic eruptions which tend to become erysipelatous. Petroleum and Rhus are the most common remedies for eruptions on the scrotum and genitals. If the woman is in run-down health, then the nipples inflame and become oversensitive to the touch of clothing. Very sensitive to change of weather, like Phos. Often sensitive to air and cold.