Below are the main rubriks (i.e strongest indications or symptoms) of Causticum in traditional homeopathic usage, not approved by the FDA.
Violent itching, esp. in the back, and in the calves of the legs.
Itching of the whole body at night (Itch).
Injuries of the skin, which had been healed, become sore again.
Tingling (or stinging) swelling (sometimes called "buzzing" swelling) (Guernsey).
Eruptions resembling scabies.
Miliary eruptions and nettle-rash.
Itching and humid tetters.
Burning ulcers, with yellowish-looking skin; ulcers burning, with corroding pus, with thin or watery pus, suppurating; jerking pains running through the ulcers.
Excoriation in children.
Painful corns in the feet.
Warts, also with pain and inflammation.
Painful varices.≡ more ...