<s>[INST] My father went to the ER because his hands and feet were turning black. He was told that he had a fungus and was prescribed a topical salve. My question. Is what kind of a fungus could this be? He had had a myriad of medical issues, the last being radiation for prostate cancer. He also has many medications he is required to take. [/INST] HIThank for asking to HCMI really apprecaite your concern for your father, looking to complaint of your fahter this seems to me, fix drug reaction, might be due to the drugs he has been taking, if I would be his doctor then I would try  to treat him with the following drugs ,1) Tab. Livocetrizine 10 mg three times in day2) Tab. Diphenhydramine three times in day (One Tab )If he fails to respond to these then I would think about the Steroid, I hope this answer would help you in taking decision, have nice day. </s>