Indicated for Minor burns, Blisters, Bloating, Burning pain, Irritable, Swelling. Cantharis is a homeopathic remedy commonly used to treat minor burns, blisters, burning pain and urinary problems. Indications for its use include frequent urging to urinate. Also burns that tend to blister. The homeopathic medicine is obtained from a vividly green colored beetle commonly known as the Spanish fly or the blister beetle. This beetle lives in honeysuckle and olive trees in certain regions in western Asia as well as southern Europe. Active ingredient: Cantharis [HPUS]. Inactive ingredients: Sucrose/lactose pellets.