An excerpt from The Clinical Materia Medica. The use of Sepia for Psoriasis, Herpes and Scabies
If we look at the symptoms of the skin, again we find the action of Sepia due to defective venous circulation. We know that when the vaso-motor nerves are inactive the skin is more sensitive to the effects of irritation, and is particularly apt to develop herpetic eruptions, especially about the elbow and knee joints. Ulcers may form about the joints, particularly about the joints of the fingers. Under Sepia, these are generally painless. There are only two other remedies that I know of with this symptom, namely, Borax and Mezereum. Sepia has been many times confirmed as a remedy in herpes circinatus.
Sepia also causes yellowish-brown spots, itching, redness, vesicles, humidity and rawness, scaling pustules. The warm room makes the urticaria patient feel comfortable, but the warmth of the bed aggravates the pricking of the skin. Dunham, guided by the tendency to scaling, recommends the drug as an antidote to Rhus poisoning. Sepia stands well in the treatment of psoriasis, though inferior to Arsenicum and Arsenicum iodatum. These yellowish-brown spots have also been removed by Lycopodium, Nux vomica and Sulphur. Curare is used by Dr. Baruch, of New York.
Besides Sepia, Calcarea ostrearum, Baryta carb. and Tellurium have been recommended for ringworm. Baryta carb. has never been successful in my hands. Tellurium is useful for ringworm over a great portion of the body intersecting rings.
In scabies, Sepia is indicated after Sulphur when pustules intersperse the itch vesicles.