The combs will heal without anything, if it is peck marks. Iodine or betadine can be used if you want. I would go through the chicken area, and look for any sharp objects where they could get cut by flying into things. Chickens do not need heat lamps unless it gets 20 below zero F or lower. People in Alaska, Canada, and Finland are here on BYC, and don't heat their coops unless it gets way down to 20-30 below. Respiratory diseases may be caused by using heat in coops that promote panting and open-mouth breathing, along with no overhead ventilation to get rid of excess humidity. Chickens keep warm just fine without heat, and it's a lot safer not using it to prevent coop fires.