Hello, I am new here, my husband has stage 4 lung cancer that meta sized in his bones and adrenal glands. He has had two rounds of pallative radiation.and three weeks ago had his first keytruda treatment. He developed a rash on his back, chest, hands and feet. Dr delayed his second treatment this week due to the rash. He is worried that they will not continue treatment due to the rash. Does anyone have experience with this. He also cannot taste anything, any suggestions to help this.