乾癬[kansen] psoriasis
苔癬[taisen] lichen
疥癬[kaisen] scabies
頑癬[tamushi] ringworm (of the body)
皮癬[hizen] scabies

皮癬ダニ[hizendani] itch mite (Sarcoptes scabiei)
疥癬虫[kaisenchuu] itch mite (Sarcoptes scabiei)
頑癬[gansen] ringworm (of the groin)
白癬[shirakumo] scalp ringworm
扁平苔癬[henpeitaisen] lichen planus

頑強[gankyou] dogged
頑健[ganken] robust health
頑固[ganko] stubbornness
頑丈[ganjou] solid
頑張る[ganbaru] to persevere

頑迷[ganmei] bigotry
頑張り[ganbari] tenacity
頑癬[tamushi] ringworm (of the body)
頑として[gantoshite] firmly, stubbornly