A homoeopathic medicine, as any other drug substance, works internally, irrespective of the route through which it is introduced into the body. Even if a drug is applied externally, intended as a local medication, it will be absorbed into the body fluids through capillary systems, conveyed through blood, lymph or other internal transport systems, undergo bio-chemical changes, and act on various target molecules, according to the configuration of their constituent molecules. This is true whether it is applied on the tongue or on the skin. Hence the term ‘external application’ is a misnomer.
Even if we decide to use a homoeopathic medicine externally, it would be ideal to use a smilimum, in potentized form, selected on the basis of symptomatology. In the case of mother tinctures and low potencies, their usage should be considered only if one intend to administer the mdicine in its crude form itself. In that case, even though we may get some palliations, it will not be much different from allopathy or ayurveda, and cannot be considered a legitimate homeopathic practice. We should bear in mind the fact that when we apply homeopathic drugs as external applications, they act on the basis of therapeutic principle of ‘Similia Similibus Curentur’.
It is an absolute blunder to consider that medicines used externally on the skin act only on the skin. The homeopathic ointments, hair tonics, creams and toilet soaps flooding the market are to be seen as the growing trend of unethical commercialization of homeopathy. Homeopaths should fight this trend with all their might.