Certain conditions, including onychomycosis, plantar fasciitis, and plantar warts can be treated with iontophoresis or phonophoresis. This is where small electrical charge or ultrasound is used to deliver a topical mediation deeper into the body. Solutions can be compounded for these treatments. New therapeutic options for onychomycosis.
https://www.ncbi.nlm.nih.gov/pubmed?term=22533461
Treatment of plantar fasciitis by iontophoresis of 0.4% dexamethasone. A randomized, double-blind, placebo-controlled study.
https://www.ncbi.nlm.nih.gov/pubmed?term=9167809
Treatment of plantar verrucae using 2% sodium salicylate iontophoresis.
https://www.ncbi.nlm.nih.gov/pubmed?term=12444877